Single-Season Leaders & Records for Losses
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| Rank | Player (age that year) | Losses | Year | IP | Throws |
|---|---|---|---|---|---|
| 1. | John Coleman (20) | 48 | 1883 | 538.1 | R |
| 2. | Will White (25) | 42 | 1880 | 517.1 | R |
| 3. | Larry McKeon (18) | 41 | 1884 | 512.0 | |
| 4. | George Bradley (26) | 40 | 1879 | 487.0 | R |
| Jim McCormick (22) | 40 | 1879 | 546.1 | R | |
| 6. | Kid Carsey (18) | 37 | 1891 | 415.0 | R |
| George Cobb (26) | 37 | 1892 | 394.1 | L | |
| Henry Porter (30) | 37 | 1888 | 474.0 | R | |
| 9. | Bill Hutchison (32) | 36 | 1892 | 622.0 | R |
| George Weidman (25) | 36 | 1886 | 427.2 | R | |
| 11. | Jim Devlin (27) | 35 | 1876 | 622.0 | R |
| Red Donahue (24) | 35 | 1897 | 348.0 | R | |
| Pud Galvin+ (23) | 35 | 1880 | 458.2 | R | |
| Hardie Henderson (22) | 35 | 1885 | 539.1 | R | |
| Fleury Sullivan (22) | 35 | 1884 | 441.0 | ||
| Adonis Terry (19) | 35 | 1884 | 476.0 | R | |
| 17. | Mark Baldwin (25) | 34 | 1889 | 513.2 | R |
| Bob Barr (27) | 34 | 1884 | 413.0 | R | |
| Matt Kilroy (20) | 34 | 1886 | 583.0 | L | |
| Bobby Mathews (24) | 34 | 1876 | 516.0 | R | |
| Al Mays (22) | 34 | 1887 | 441.1 | R | |
| Amos Rusie+ (19) | 34 | 1890 | 548.2 | R | |
| 23. | Jersey Bakley (24) | 33 | 1888 | 532.2 | R |
| Hardie Henderson (20) | 33 | 1883 | 367.1 | R | |
| Harry McCormick (23) | 33 | 1879 | 457.1 | R | |
| Frank Mountain (23) | 33 | 1883 | 503.0 | R | |
| Lee Richmond (25) | 33 | 1882 | 411.0 | L | |
| Dupee Shaw (25) | 33 | 1884 | 543.1 | L | |
| Jim Whitney (23) | 33 | 1881 | 552.1 | R | |
| 30. | John Harkins (25) | 32 | 1884 | 391.0 | R |
| Lee Richmond (23) | 32 | 1880 | 590.2 | L | |
| Jim Whitney (27) | 32 | 1885 | 441.1 | R | |
| Jim Whitney (28) | 32 | 1886 | 393.0 | R | |
| 34. | Billy Crowell (21) | 31 | 1887 | 389.1 | R |
| Old Hoss Radbourn+ (31) | 31 | 1886 | 509.1 | R | |
| Amos Rusie+ (21) | 31 | 1892 | 541.0 | R | |
| Dupee Shaw (27) | 31 | 1886 | 385.2 | L | |
| Sam Weaver (22) | 31 | 1878 | 383.0 | R | |
| Will White (24) | 31 | 1879 | 680.0 | R | |
| 40. | Jersey Bakley (20) | 30 | 1884 | 394.2 | R |
| Ed Beatin (23) | 30 | 1890 | 474.1 | L | |
| Theodore Breitenstein (26) | 30 | 1895 | 438.2 | L | |
| John Ewing (26) | 30 | 1889 | 331.0 | R | |
| Jim Hughey (30) | 30 | 1899 | 283.0 | R | |
| Jack Lynch (29) | 30 | 1886 | 432.2 | R | |
| Jim McCormick (24) | 30 | 1881 | 526.0 | R | |
| Jim McCormick (25) | 30 | 1882 | 595.2 | R | |
| Toad Ramsey (23) | 30 | 1888 | 342.1 | L | |
| Phenomenal Smith (22) | 30 | 1887 | 491.1 | L | |
| Mickey Welch+ (20) | 30 | 1880 | 574.0 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| 51. | Tommy Bond (24) | 29 | 1880 | 493.0 | R |
| Bert Cunningham (22) | 29 | 1888 | 453.1 | R | |
| Red Ehret (20) | 29 | 1889 | 364.0 | R | |
| Pud Galvin+ (26) | 29 | 1883 | 656.1 | R | |
| Bill Hart (30) | 29 | 1896 | 336.0 | R | |
| Egyptian Healy (20) | 29 | 1887 | 341.0 | R | |
| Silver King (23) | 29 | 1891 | 384.1 | R | |
| Doc Landis (27) | 29 | 1882 | 359.0 | ||
| Hank O'Day+ (28) | 29 | 1888 | 403.0 | R | |
| Jack Taylor (25) | 29 | 1898 | 397.1 | R | |
| Vic Willis+ (29) | 29 | 1905 | 342.0 | R | |
| 62. | Mark Baldwin (27) | 28 | 1891 | 437.2 | R |
| Hugh Daily (36) | 28 | 1884 | 500.2 | R | |
| Duke Esper (25) | 28 | 1893 | 334.1 | L | |
| Bill Hill (21) | 28 | 1896 | 319.2 | L | |
| Jim McCormick (23) | 28 | 1880 | 657.2 | R | |
| Hank O'Day+ (24) | 28 | 1884 | 326.2 | R | |
| Gus Weyhing (20) | 28 | 1887 | 466.1 | R | |
| 69. | Mark Baldwin (28) | 27 | 1892 | 440.1 | R |
| George Bell (35) | 27 | 1910 | 310.0 | R | |
| Charlie Buffinton (24) | 27 | 1885 | 434.1 | R | |
| Bill Carrick (25) | 27 | 1899 | 361.2 | R | |
| Paul Derringer (26) | 27 | 1933 | 248.0 | R | |
| Chick Fraser (22) | 27 | 1896 | 349.1 | R | |
| Pud Galvin+ (22) | 27 | 1879 | 593.0 | R | |
| Bill Hart (31) | 27 | 1897 | 294.2 | R | |
| Pink Hawley (21) | 27 | 1894 | 392.2 | R | |
| Tim Keefe+ (24) | 27 | 1881 | 403.0 | R | |
| Tim Keefe+ (26) | 27 | 1883 | 619.0 | R | |
| Phil Knell (26) | 27 | 1891 | 462.0 | L | |
| Al Mays (21) | 27 | 1886 | 350.0 | R | |
| Tony Mullane (27) | 27 | 1886 | 529.2 | R | |
| Toad Ramsey (21) | 27 | 1886 | 588.2 | L | |
| Toad Ramsey (22) | 27 | 1887 | 561.0 | L | |
| Willie Sudhoff (23) | 27 | 1898 | 315.0 | R | |
| Park Swartzel (23) | 27 | 1889 | 410.1 | R | |
| Luther Taylor (26) | 27 | 1901 | 353.1 | R | |
| 88. | Al Atkinson (23) | 26 | 1884 | 393.2 | R |
| Theodore Breitenstein (27) | 26 | 1896 | 339.2 | L | |
| Dory Dean (23) | 26 | 1876 | 262.2 | R | |
| George Derby (23) | 26 | 1881 | 494.2 | R | |
| Gus Dorner (29) | 26 | 1906 | 288.1 | R | |
| Pud Galvin+ (28) | 26 | 1885 | 372.1 | R | |
| Bob Groom (24) | 26 | 1909 | 260.2 | R | |
| George Haddock (23) | 26 | 1890 | 290.2 | R | |
| Tim Keefe+ (25) | 26 | 1882 | 376.0 | R | |
| Frank Killen (21) | 26 | 1892 | 459.2 | L | |
| John Kirby (21) | 26 | 1886 | 325.0 | R | |
| Terry Larkin (22) | 26 | 1878 | 506.0 | R | |
| Tony Mullane (25) | 26 | 1884 | 567.0 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Tony Mullane (32) | 26 | 1891 | 426.1 | R | |
| Jack Neagle (26) | 26 | 1884 | 326.0 | R | |
| Lee Richmond (24) | 26 | 1881 | 462.1 | L | |
| Dupee Shaw (26) | 26 | 1885 | 399.2 | L | |
| Harry Staley (22) | 26 | 1889 | 420.0 | R | |
| Happy Townsend (25) | 26 | 1904 | 291.1 | R | |
| Gus Weyhing (31) | 26 | 1898 | 361.0 | R | |
| 108. | Jersey Bakley (26) | 25 | 1890 | 326.1 | R |
| Ben Cantwell (33) | 25 | 1935 | 210.2 | R | |
| Jim Devlin (28) | 25 | 1877 | 559.0 | R | |
| Pete Dowling (24) | 25 | 1901 | 306.0 | L | |
| Charlie Ferguson (21) | 25 | 1884 | 416.2 | R | |
| Patsy Flaherty (27) | 25 | 1903 | 293.2 | L | |
| Pud Galvin+ (31) | 25 | 1888 | 437.1 | R | |
| Pretzels Getzien (21) | 25 | 1885 | 330.0 | R | |
| Pretzels Getzien (24) | 25 | 1888 | 404.0 | R | |
| Fred Glade (29) | 25 | 1905 | 275.0 | R | |
| Bill Hutchison (30) | 25 | 1890 | 603.0 | R | |
| Walter Johnson+ (21) | 25 | 1909 | 296.1 | R | |
| Oscar Jones (24) | 25 | 1904 | 377.0 | R | |
| Matt Kilroy (23) | 25 | 1889 | 480.2 | L | |
| Terry Larkin (21) | 25 | 1877 | 501.0 | R | |
| Jim McCormick (27) | 25 | 1884 | 569.0 | R | |
| Stoney McGlynn (35) | 25 | 1907 | 352.1 | R | |
| Harry McIntire (26) | 25 | 1905 | 308.2 | R | |
| Sadie McMahon (24) | 25 | 1892 | 397.0 | R | |
| John Menefee (26) | 25 | 1894 | 323.1 | R | |
| Mike Morrison (20) | 25 | 1887 | 316.2 | R | |
| Scott Perry (29) | 25 | 1920 | 263.2 | R | |
| Old Hoss Radbourn+ (28) | 25 | 1883 | 632.1 | R | |
| Bugs Raymond (26) | 25 | 1908 | 324.1 | R | |
| Red Ruffing+ (23) | 25 | 1928 | 289.1 | R | |
| Ed Seward (20) | 25 | 1887 | 470.2 | R | |
| Harry Staley (23) | 25 | 1890 | 396.2 | R | |
| Vic Willis+ (28) | 25 | 1904 | 350.0 | R | |
| Irv Young (28) | 25 | 1906 | 358.1 | L | |
| 137. | Mark Baldwin (26) | 24 | 1890 | 492.0 | R |
| Bob Barr (33) | 24 | 1890 | 493.1 | R | |
| Henry Boyle (24) | 24 | 1885 | 366.2 | R | |
| Henry Boyle (26) | 24 | 1887 | 328.0 | R | |
| Theodore Breitenstein (24) | 24 | 1893 | 382.2 | L | |
| Bullet Joe Bush (23) | 24 | 1916 | 286.2 | R | |
| Pat Caraway (25) | 24 | 1931 | 220.0 | L | |
| Dad Clarke (31) | 24 | 1896 | 351.0 | R | |
| Roger Craig (32) | 24 | 1962 | 233.1 | R | |
| Ed Crane (30) | 24 | 1892 | 364.1 | R | |
| Bert Cunningham (24) | 24 | 1890 | 319.2 | R | |
| Cliff Curtis (28) | 24 | 1910 | 251.0 | R | |
| Red Donahue (23) | 24 | 1896 | 267.0 | R | |
| Jack Fisher (26) | 24 | 1965 | 253.2 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Chick Fraser (30) | 24 | 1904 | 302.0 | R | |
| Pud Galvin+ (24) | 24 | 1881 | 474.0 | R | |
| Kid Gleason (26) | 24 | 1892 | 400.0 | R | |
| Sam Gray (33) | 24 | 1931 | 258.0 | R | |
| Egyptian Healy (21) | 24 | 1888 | 321.1 | R | |
| Jim Hughey (29) | 24 | 1898 | 283.2 | R | |
| Bill Hutchison (33) | 24 | 1893 | 348.1 | R | |
| John Keefe (22) | 24 | 1890 | 352.1 | L | |
| Silver King (24) | 24 | 1892 | 410.1 | R | |
| Sadie McMahon (23) | 24 | 1891 | 503.0 | R | |
| Ed Morris (22) | 24 | 1885 | 581.0 | L | |
| Tony Mullane (23) | 24 | 1882 | 460.1 | R | |
| Henry Porter (29) | 24 | 1887 | 339.2 | R | |
| Billy Rhines (22) | 24 | 1891 | 372.2 | R | |
| Lev Shreve (22) | 24 | 1888 | 297.2 | R | |
| John Ward+ (20) | 24 | 1880 | 595.0 | R | |
| George Weidman (22) | 24 | 1883 | 402.1 | R | |
| George Weidman (24) | 24 | 1885 | 330.0 | R | |
| 169. | Red Ames (31) | 23 | 1914 | 297.0 | R |
| Henry Boyle (28) | 23 | 1889 | 378.2 | R | |
| George Bradley (24) | 23 | 1877 | 394.0 | R | |
| Theodore Breitenstein (25) | 23 | 1894 | 447.1 | L | |
| Buster Brown (28) | 23 | 1910 | 263.0 | R | |
| Ice Box Chamberlain (23) | 23 | 1891 | 405.2 | R | |
| Ice Box Chamberlain (24) | 23 | 1892 | 406.1 | R | |
| Larry Corcoran (24) | 23 | 1884 | 516.2 | R | |
| Jack Cronin (30) | 23 | 1904 | 307.0 | R | |
| Ed Daily (22) | 23 | 1885 | 440.0 | R | |
| Frank Dwyer (23) | 23 | 1891 | 375.0 | R | |
| Cecil Ferguson (25) | 23 | 1909 | 226.2 | R | |
| Pud Galvin+ (25) | 23 | 1882 | 445.1 | R | |
| Henry Gruber (26) | 23 | 1890 | 383.1 | R | |
| Egyptian Healy (19) | 23 | 1886 | 353.2 | R | |
| Guy Hecker (27) | 23 | 1883 | 469.0 | R | |
| Guy Hecker (29) | 23 | 1885 | 480.0 | R | |
| Guy Hecker (30) | 23 | 1886 | 420.2 | R | |
| Hardie Henderson (21) | 23 | 1884 | 439.1 | R | |
| Tom Hughes (22) | 23 | 1901 | 308.1 | R | |
| Tom Hughes (25) | 23 | 1904 | 260.2 | R | |
| Beany Jacobson (23) | 23 | 1904 | 253.2 | L | |
| Frank Killen (26) | 23 | 1897 | 337.1 | L | |
| Terry Larkin (23) | 23 | 1879 | 513.1 | R | |
| Sam Leever (27) | 23 | 1899 | 379.0 | R | |
| Vive Lindaman (28) | 23 | 1906 | 307.1 | R | |
| Dolf Luque (31) | 23 | 1922 | 261.0 | R | |
| Jim McCormick (30) | 23 | 1887 | 322.1 | R | |
| Charlie McCullough (24) | 23 | 1890 | 241.2 | R | |
| James McJames (22) | 23 | 1897 | 323.2 | R | |
| Lee Meadows (21) | 23 | 1916 | 289.0 | R | |
| Frank Meinke (20) | 23 | 1884 | 289.0 | ||
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Win Mercer (20) | 23 | 1894 | 339.1 | R | |
| Win Mercer (21) | 23 | 1895 | 313.1 | R | |
| Ed Morris (25) | 23 | 1888 | 480.0 | L | |
| George Mullin (23) | 23 | 1904 | 382.1 | R | |
| Elmer Myers (22) | 23 | 1916 | 315.0 | R | |
| Rollie Naylor (28) | 23 | 1920 | 250.2 | R | |
| Jack Neagle (25) | 23 | 1883 | 221.1 | R | |
| Tricky Nichols (26) | 23 | 1877 | 350.0 | R | |
| Orval Overall (24) | 23 | 1905 | 318.0 | R | |
| Casey Patten (30) | 23 | 1904 | 357.2 | L | |
| Old Hoss Radbourn+ (32) | 23 | 1887 | 425.0 | R | |
| Eddie Rommel (23) | 23 | 1921 | 285.1 | R | |
| Amos Rusie+ (24) | 23 | 1895 | 393.1 | R | |
| Scott Stratton (23) | 23 | 1893 | 314.2 | R | |
| Mickey Welch+ (23) | 23 | 1883 | 426.0 | R | |
| Irvin Wilhelm (28) | 23 | 1905 | 242.1 | R | |
| Irv Young (29) | 23 | 1907 | 245.1 | L | |
| 218. | Jersey Bakley (25) | 22 | 1889 | 304.1 | R |
| Bill Bonham (25) | 22 | 1974 | 242.2 | R | |
| Henry Boyle (27) | 22 | 1888 | 323.0 | R | |
| Bill Carrick (26) | 22 | 1900 | 341.2 | R | |
| Bill Carrick (27) | 22 | 1901 | 324.0 | R | |
| Dan Casey (27) | 22 | 1890 | 360.2 | L | |
| Roger Craig (33) | 22 | 1963 | 236.0 | R | |
| Ed Crane (29) | 22 | 1891 | 366.2 | R | |
| Art Ditmar (27) | 22 | 1956 | 254.1 | R | |
| Dick Ellsworth (26) | 22 | 1966 | 269.1 | L | |
| Pud Galvin+ (27) | 22 | 1884 | 636.1 | R | |
| Pretzels Getzien (25) | 22 | 1889 | 349.0 | R | |
| Kid Gleason (25) | 22 | 1891 | 418.0 | R | |
| Kid Gleason (27) | 22 | 1893 | 380.1 | R | |
| Dan Griner (25) | 22 | 1913 | 225.0 | R | |
| Henry Gruber (27) | 22 | 1891 | 348.2 | R | |
| Pink Hawley (22) | 22 | 1895 | 444.1 | R | |
| Harry Howell (28) | 22 | 1905 | 323.0 | R | |
| Si Johnson (27) | 22 | 1934 | 215.2 | R | |
| Randy Jones (24) | 22 | 1974 | 208.1 | L | |
| Brickyard Kennedy (30) | 22 | 1898 | 339.1 | R | |
| Silver King (22) | 22 | 1890 | 461.0 | R | |
| Charlie Knepper (28) | 22 | 1899 | 219.2 | R | |
| Lon Knight (23) | 22 | 1876 | 282.0 | R | |
| Joe Lake (27) | 22 | 1908 | 269.1 | R | |
| Rube Marquard+ (27) | 22 | 1914 | 268.0 | L | |
| Denny McLain (27) | 22 | 1971 | 216.2 | R | |
| Ed Morris (24) | 22 | 1887 | 317.2 | L | |
| Frank Mountain (22) | 22 | 1882 | 213.0 | R | |
| Hugh Mulcahy (26) | 22 | 1940 | 280.0 | R | |
| Tony Mullane (34) | 22 | 1893 | 367.0 | R | |
| The Only Nolan (22) | 22 | 1878 | 347.0 | R | |
| Al Orth (30) | 22 | 1903 | 279.2 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Casey Patten (29) | 22 | 1903 | 300.0 | L | |
| Big Jeff Pfeffer (24) | 22 | 1906 | 302.1 | R | |
| Togie Pittinger (31) | 22 | 1903 | 351.2 | R | |
| Jack Quinn (31) | 22 | 1915 | 273.2 | R | |
| Eppa Rixey+ (29) | 22 | 1920 | 284.1 | L | |
| Robin Roberts+ (30) | 22 | 1957 | 249.2 | R | |
| Steve Rogers (24) | 22 | 1974 | 253.2 | R | |
| Red Ruffing+ (24) | 22 | 1929 | 244.1 | R | |
| Jack Stivetts (23) | 22 | 1891 | 440.0 | R | |
| Lefty Tyler (22) | 22 | 1912 | 256.1 | L | |
| Sam Weaver (27) | 22 | 1883 | 400.2 | R | |
| Mickey Welch+ (26) | 22 | 1886 | 500.0 | R | |
| Will White (28) | 22 | 1883 | 577.0 | R | |
| Irvin Wilhelm (31) | 22 | 1908 | 332.0 | R | |
| Weldon Wyckoff (24) | 22 | 1915 | 276.0 | R | |
| Joe Yeager (22) | 22 | 1898 | 291.1 | R | |
| Cy Young+ (24) | 22 | 1891 | 423.2 | R | |
| 268. | Steve Arlin (26) | 21 | 1972 | 250.0 | R |
| Stan Bahnsen (28) | 21 | 1973 | 282.1 | R | |
| Jesse Barnes (24) | 21 | 1917 | 295.0 | R | |
| Fred Beebe (29) | 21 | 1909 | 287.2 | R | |
| Ed Brandt (23) | 21 | 1928 | 225.1 | L | |
| John Clarkson+ (25) | 21 | 1887 | 523.0 | R | |
| Ed Cushman (33) | 21 | 1885 | 278.0 | L | |
| Ed Cushman (34) | 21 | 1886 | 325.2 | L | |
| Ed Cushman (38) | 21 | 1890 | 315.2 | L | |
| Hooks Dauss (30) | 21 | 1920 | 270.1 | R | |
| Paul Derringer (27) | 21 | 1934 | 261.0 | R | |
| Murry Dickson (35) | 21 | 1952 | 277.2 | R | |
| Bill Dinneen (26) | 21 | 1902 | 371.1 | R | |
| Denny Driscoll (27) | 21 | 1883 | 336.1 | L | |
| Jack Dunn (25) | 21 | 1898 | 322.2 | R | |
| Frank Dwyer (26) | 21 | 1894 | 348.0 | R | |
| Mal Eason (26) | 21 | 1905 | 207.0 | R | |
| Red Ehret (25) | 21 | 1894 | 346.2 | R | |
| Dana Fillingim (26) | 21 | 1920 | 272.0 | R | |
| Russ Ford (29) | 21 | 1912 | 291.2 | R | |
| Frank Foreman (26) | 21 | 1889 | 414.0 | R | |
| Chick Fraser (31) | 21 | 1905 | 334.1 | R | |
| Pud Galvin+ (29) | 21 | 1886 | 434.2 | R | |
| Pud Galvin+ (30) | 21 | 1887 | 440.2 | R | |
| Bump Hadley (27) | 21 | 1932 | 248.1 | R | |
| Bob Harmon (25) | 21 | 1913 | 273.1 | R | |
| Harry Harper (24) | 21 | 1919 | 208.0 | L | |
| Joe Harris (24) | 21 | 1906 | 235.0 | R | |
| Lum Harris (28) | 21 | 1943 | 216.1 | R | |
| Slim Harriss (29) | 21 | 1927 | 217.2 | R | |
| Pink Hawley (23) | 21 | 1896 | 378.0 | R | |
| Egyptian Healy (23) | 21 | 1890 | 389.0 | R | |
| Harry Howell (24) | 21 | 1901 | 294.2 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Harry Howell (27) | 21 | 1904 | 299.2 | R | |
| Bill Hutchison (35) | 21 | 1895 | 291.0 | R | |
| Larry Jackson (34) | 21 | 1965 | 257.1 | R | |
| Sad Sam Jones (32) | 21 | 1925 | 246.2 | R | |
| Harry Kelley (31) | 21 | 1937 | 205.0 | R | |
| Matt Kilroy (22) | 21 | 1888 | 321.0 | L | |
| Phil Knell (29) | 21 | 1894 | 254.0 | L | |
| Don Larsen (24) | 21 | 1954 | 201.2 | R | |
| Mickey Lolich (33) | 21 | 1974 | 308.0 | L | |
| Jack Lynch (28) | 21 | 1885 | 379.0 | R | |
| Ted Lyons+ (32) | 21 | 1933 | 228.0 | R | |
| Mike Maroth (25) | 21 | 2003 | 193.1 | L | |
| Al Mattern (26) | 21 | 1909 | 316.1 | L | |
| Al Maul (27) | 21 | 1893 | 297.0 | R | |
| Harry McIntire (27) | 21 | 1906 | 276.0 | R | |
| Sadie McMahon (22) | 21 | 1890 | 509.0 | R | |
| George Mullin (24) | 21 | 1905 | 347.2 | R | |
| Joe Oeschger (30) | 21 | 1922 | 195.2 | R | |
| Al Orth (34) | 21 | 1907 | 248.2 | R | |
| Casey Patten (31) | 21 | 1905 | 309.2 | L | |
| George Pechiney (24) | 21 | 1886 | 330.1 | R | |
| Barney Pelty (26) | 21 | 1907 | 273.0 | R | |
| Togie Pittinger (32) | 21 | 1904 | 335.1 | R | |
| Henry Porter (27) | 21 | 1885 | 481.2 | R | |
| Old Hoss Radbourn+ (30) | 21 | 1885 | 445.2 | R | |
| Eppa Rixey+ (26) | 21 | 1917 | 281.1 | L | |
| Nap Rucker (27) | 21 | 1912 | 297.2 | L | |
| Amos Rusie+ (22) | 21 | 1893 | 482.0 | R | |
| Fred Sanford (28) | 21 | 1948 | 227.0 | R | |
| Jack Scott (28) | 21 | 1920 | 291.0 | R | |
| Jack Scott (35) | 21 | 1927 | 233.1 | R | |
| Jim Scott (25) | 21 | 1913 | 312.1 | R | |
| Billy Serad (23) | 21 | 1885 | 241.1 | R | |
| Jack Stivetts (22) | 21 | 1890 | 419.1 | R | |
| Bill Sweeney (26) | 21 | 1884 | 538.0 | R | |
| Charlie Sweeney (22) | 21 | 1885 | 275.0 | R | |
| Jack Taylor (23) | 21 | 1896 | 359.0 | R | |
| Jack Taylor (25) | 21 | 1899 | 354.2 | R | |
| Jack Taylor (31) | 21 | 1905 | 309.0 | R | |
| Jim Tobin (29) | 21 | 1942 | 287.2 | R | |
| Tom Vickery (23) | 21 | 1890 | 382.0 | R | |
| Bucky Walters (27) | 21 | 1936 | 258.0 | R | |
| Mickey Welch+ (24) | 21 | 1884 | 557.1 | R | |
| Gus Weyhing (22) | 21 | 1889 | 449.0 | R | |
| Gus Weyhing (25) | 21 | 1892 | 469.2 | R | |
| Gus Weyhing (28) | 21 | 1895 | 231.0 | R | |
| Gus Weyhing (32) | 21 | 1899 | 334.2 | R | |
| Will White (23) | 21 | 1878 | 468.0 | R | |
| Jim Whitney (24) | 21 | 1882 | 420.0 | R | |
| Jim Whitney (25) | 21 | 1883 | 514.0 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Jim Whitney (29) | 21 | 1887 | 404.2 | R | |
| Jim Whitney (30) | 21 | 1888 | 325.0 | R | |
| George Weidman (23) | 21 | 1884 | 212.2 | R | |
| Stan Yerkes (27) | 21 | 1902 | 272.2 | R | |
| Cy Young+ (27) | 21 | 1894 | 408.2 | R | |
| Cy Young+ (39) | 21 | 1906 | 287.2 | R | |
| Irv Young (27) | 21 | 1905 | 378.0 | L | |
| 358. | Nate Andrews (29) | 20 | 1943 | 283.2 | R |
| Bill Bailey (27) | 20 | 1915 | 223.2 | L | |
| Mark Baldwin (29) | 20 | 1893 | 333.2 | R | |
| Jesse Barnes (31) | 20 | 1924 | 267.2 | R | |
| Dick Barrett (38) | 20 | 1945 | 190.2 | R | |
| George Baumgardner (21) | 20 | 1913 | 253.1 | R | |
| Boom-Boom Beck (28) | 20 | 1933 | 257.0 | R | |
| Rube Benton (22) | 20 | 1912 | 302.0 | L | |
| Joe Bowman (26) | 20 | 1936 | 203.2 | R | |
| Harry Byrd (28) | 20 | 1953 | 236.2 | R | |
| Howie Camnitz (31) | 20 | 1913 | 241.1 | R | |
| Steve Carlton+ (28) | 20 | 1973 | 293.1 | L | |
| George Caster (30) | 20 | 1938 | 281.1 | R | |
| Jack Chesbro+ (34) | 20 | 1908 | 288.2 | R | |
| John Clarkson+ (26) | 20 | 1888 | 483.1 | R | |
| Pete Conway (19) | 20 | 1886 | 271.0 | R | |
| Larry Corcoran (23) | 20 | 1883 | 473.2 | R | |
| Nick Cullop (26) | 20 | 1914 | 299.0 | L | |
| George Derby (24) | 20 | 1882 | 362.0 | R | |
| Murry Dickson (37) | 20 | 1954 | 226.1 | R | |
| Bill Dinneen (23) | 20 | 1899 | 291.0 | R | |
| Bill Doak (26) | 20 | 1917 | 281.1 | R | |
| Phil Douglas (27) | 20 | 1917 | 293.1 | R | |
| Pete Dowling (21) | 20 | 1898 | 285.2 | L | |
| Howard Ehmke (31) | 20 | 1925 | 260.2 | R | |
| Red Ehret (23) | 20 | 1892 | 316.0 | R | |
| Dick Ellsworth (22) | 20 | 1962 | 208.2 | L | |
| Cy Falkenberg (26) | 20 | 1906 | 298.2 | R | |
| Turk Farrell (28) | 20 | 1962 | 241.2 | R | |
| Charlie Ferguson (22) | 20 | 1885 | 405.0 | R | |
| Cherokee Fisher (31) | 20 | 1876 | 229.1 | R | |
| Frank Foreman (28) | 20 | 1891 | 345.1 | R | |
| Chick Fraser (24) | 20 | 1898 | 245.0 | R | |
| Chick Fraser (32) | 20 | 1906 | 236.0 | R | |
| Ned Garvin (27) | 20 | 1901 | 257.1 | R | |
| Milt Gaston (34) | 20 | 1930 | 273.0 | R | |
| Les German (27) | 20 | 1896 | 169.1 | R | |
| Frank Gilmore (23) | 20 | 1887 | 234.2 | R | |
| Bob Groom (29) | 20 | 1914 | 280.2 | R | |
| Bump Hadley (28) | 20 | 1933 | 316.2 | R | |
| Noodles Hahn (21) | 20 | 1900 | 311.1 | L | |
| Jesse Haines+ (26) | 20 | 1920 | 301.2 | R | |
| John Harkins (26) | 20 | 1885 | 293.0 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Slim Harriss (24) | 20 | 1922 | 229.2 | R | |
| Guy Hecker (28) | 20 | 1884 | 670.2 | R | |
| Glen Hobbie (24) | 20 | 1960 | 258.2 | R | |
| Art Houtteman (24) | 20 | 1952 | 221.0 | R | |
| Tom Hughes (26) | 20 | 1905 | 291.1 | R | |
| Bert Inks (24) | 20 | 1895 | 205.1 | L | |
| Al Jackson (26) | 20 | 1962 | 231.1 | L | |
| Al Jackson (29) | 20 | 1965 | 205.1 | L | |
| Walter Johnson+ (28) | 20 | 1916 | 369.2 | R | |
| Sad Sam Jones (26) | 20 | 1919 | 245.0 | R | |
| Sam Jones (29) | 20 | 1955 | 241.2 | R | |
| Tim Keefe+ (29) | 20 | 1886 | 535.0 | R | |
| Alex Kellner (25) | 20 | 1950 | 225.1 | L | |
| Brickyard Kennedy (25) | 20 | 1893 | 382.2 | R | |
| Brickyard Kennedy (26) | 20 | 1894 | 360.2 | R | |
| Brickyard Kennedy (28) | 20 | 1896 | 305.2 | R | |
| Brickyard Kennedy (29) | 20 | 1897 | 343.1 | R | |
| Vern Kennedy (32) | 20 | 1939 | 212.2 | R | |
| Henry Keupper (27) | 20 | 1914 | 213.0 | L | |
| Frank Killen (27) | 20 | 1898 | 306.0 | L | |
| Ed Killian (27) | 20 | 1904 | 331.2 | L | |
| Sam Kimber (31) | 20 | 1884 | 361.1 | R | |
| Brian Kingman (26) | 20 | 1980 | 211.1 | R | |
| Silver King (20) | 20 | 1888 | 584.2 | R | |
| Clay Kirby (21) | 20 | 1969 | 215.2 | R | |
| Jerry Koosman (34) | 20 | 1977 | 226.2 | L | |
| Ted Lyons+ (28) | 20 | 1929 | 259.1 | R | |
| Joe McGinnity+ (30) | 20 | 1901 | 382.0 | R | |
| Joe McGinnity+ (32) | 20 | 1903 | 434.0 | R | |
| Harry McIntire (29) | 20 | 1908 | 288.0 | R | |
| James McJames (21) | 20 | 1896 | 280.1 | R | |
| Lee Meadows (24) | 20 | 1919 | 250.1 | R | |
| Jouett Meekin (25) | 20 | 1892 | 268.1 | R | |
| Rube Melton (25) | 20 | 1942 | 209.1 | R | |
| Win Mercer (23) | 20 | 1897 | 342.0 | R | |
| Roscoe Miller (25) | 20 | 1902 | 221.1 | R | |
| Ed Morris (23) | 20 | 1886 | 555.1 | L | |
| Hugh Mulcahy (24) | 20 | 1938 | 267.1 | R | |
| George Mullin (26) | 20 | 1907 | 357.1 | R | |
| Jack Nabors (28) | 20 | 1916 | 212.2 | R | |
| Bobo Newsom (26) | 20 | 1934 | 262.1 | R | |
| Bobo Newsom (33) | 20 | 1941 | 250.1 | R | |
| Bobo Newsom (37) | 20 | 1945 | 257.1 | R | |
| Phil Niekro+ (38) | 20 | 1977 | 330.1 | R | |
| Phil Niekro+ (40) | 20 | 1979 | 342.0 | R | |
| Hank O'Day+ (27) | 20 | 1887 | 254.2 | R | |
| Jim Pastorius (26) | 20 | 1908 | 213.2 | L | |
| Orlando Peña (29) | 20 | 1963 | 217.0 | R | |
| Ken Raffensberger (26) | 20 | 1944 | 258.2 | L | |
| Pedro Ramos (26) | 20 | 1961 | 264.1 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Bill Reidy (27) | 20 | 1901 | 301.1 | R | |
| Gordon Rhodes (28) | 20 | 1936 | 216.1 | R | |
| Bob Rush (24) | 20 | 1950 | 254.2 | R | |
| Amos Rusie+ (20) | 20 | 1891 | 500.1 | R | |
| Jack Russell (24) | 20 | 1930 | 229.2 | R | |
| Ed Scott (29) | 20 | 1900 | 315.0 | R | |
| Billy Serad (22) | 20 | 1884 | 308.0 | R | |
| Charlie Smith (27) | 20 | 1907 | 258.2 | R | |
| Eddie Smith (28) | 20 | 1942 | 215.0 | L | |
| George Smith (29) | 20 | 1921 | 221.1 | R | |
| Phenomenal Smith (23) | 20 | 1888 | 314.0 | L | |
| Tracy Stallard (26) | 20 | 1964 | 225.2 | R | |
| Chuck Stobbs (27) | 20 | 1957 | 211.2 | L | |
| Mel Stottlemyre (24) | 20 | 1966 | 251.0 | R | |
| Willie Sudhoff (30) | 20 | 1905 | 244.0 | R | |
| Jack Taylor (24) | 20 | 1897 | 317.1 | R | |
| Luis Tiant (28) | 20 | 1969 | 249.2 | R | |
| Lee Viau (22) | 20 | 1889 | 373.0 | R | |
| Alex Voss (26) | 20 | 1884 | 239.1 | R | |
| Ed Walsh+ (29) | 20 | 1910 | 369.2 | R | |
| Gus Weyhing (24) | 20 | 1891 | 450.0 | R | |
| Doc White (23) | 20 | 1902 | 306.0 | L | |
| Wild Bill Widner (22) | 20 | 1889 | 294.0 | R | |
| George Weidman (21) | 20 | 1882 | 411.0 | R | |
| Bill Wight (26) | 20 | 1948 | 223.1 | L | |
| Irvin Wilhelm (27) | 20 | 1904 | 288.0 | R | |
| Roy Wilkinson (28) | 20 | 1921 | 198.1 | R | |
| Vic Willis+ (26) | 20 | 1902 | 410.0 | R | |
| Wilbur Wood (31) | 20 | 1973 | 359.1 | L | |
| Wilbur Wood (33) | 20 | 1975 | 291.1 | L | |
| Clyde Wright (33) | 20 | 1974 | 232.0 | L | |
| George Zettlein (31) | 20 | 1876 | 234.0 | R | |
| 483. | Chris Archer (27) | 19 | 2016 | 201.1 | R |
| Steve Arlin (25) | 19 | 1971 | 227.2 | R | |
| Kirtley Baker (21) | 19 | 1890 | 178.1 | R | |
| Fred Beebe (27) | 19 | 1907 | 238.1 | R | |
| Joe Benz (28) | 19 | 1914 | 283.1 | R | |
| Jim Bibby (29) | 19 | 1974 | 264.0 | R | |
| George Blaeholder (29) | 19 | 1933 | 255.2 | R | |
| Vida Blue (27) | 19 | 1977 | 279.2 | L | |
| Jeremy Bonderman (20) | 19 | 2003 | 162.0 | R | |
| Tommy Bond (22) | 19 | 1878 | 532.2 | R | |
| Tommy Bond (23) | 19 | 1879 | 555.1 | R | |
| George Bradley (23) | 19 | 1876 | 573.0 | R | |
| Ed Brandt (30) | 19 | 1935 | 174.2 | L | |
| Theodore Breitenstein (23) | 19 | 1892 | 282.1 | L | |
| Lou Brissie (26) | 19 | 1950 | 246.0 | L | |
| George Brunet (32) | 19 | 1967 | 250.0 | L | |
| Howie Camnitz (32) | 19 | 1914 | 262.0 | R | |
| Steve Carlton+ (25) | 19 | 1970 | 253.2 | L | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Ownie Carroll (29) | 19 | 1932 | 210.0 | R | |
| George Caster (29) | 19 | 1937 | 231.2 | R | |
| George Caster (32) | 19 | 1940 | 178.1 | R | |
| Ken Chase (25) | 19 | 1939 | 232.0 | L | |
| Eddie Cicotte (34) | 19 | 1918 | 266.0 | R | |
| Galen Cisco (28) | 19 | 1964 | 191.2 | R | |
| John Clarkson+ (27) | 19 | 1889 | 620.0 | R | |
| John Clarkson+ (29) | 19 | 1891 | 460.2 | R | |
| Watson Clark (27) | 19 | 1929 | 279.0 | L | |
| Jim Conway (30) | 19 | 1889 | 335.0 | R | |
| Wilbur Cooper (31) | 19 | 1923 | 294.2 | L | |
| Patrick Corbin (32) | 19 | 2022 | 152.2 | L | |
| Ed Crane (28) | 19 | 1890 | 330.1 | R | |
| Bert Cunningham (23) | 19 | 1889 | 279.1 | R | |
| Omar Daal (28) | 19 | 2000 | 167.0 | L | |
| Hugh Daily (35) | 19 | 1883 | 378.2 | R | |
| José DeLeón (24) | 19 | 1985 | 162.2 | R | |
| José DeLeón (29) | 19 | 1990 | 182.2 | R | |
| Paul Derringer (29) | 19 | 1936 | 282.1 | R | |
| Murry Dickson (36) | 19 | 1953 | 200.2 | R | |
| Walt Dickson (33) | 19 | 1912 | 189.0 | R | |
| Walt Dickson (35) | 19 | 1914 | 256.2 | R | |
| Bill Dinneen (30) | 19 | 1906 | 218.2 | R | |
| Ed Doheny (24) | 19 | 1898 | 213.0 | L | |
| Gus Dorner (31) | 19 | 1908 | 216.1 | R | |
| Bill Duggleby (32) | 19 | 1906 | 280.1 | R | |
| Jesse Duryea (29) | 19 | 1889 | 401.0 | R | |
| Red Ehret (26) | 19 | 1895 | 231.2 | R | |
| Sammy Ellis (25) | 19 | 1966 | 221.0 | R | |
| Scott Erickson (25) | 19 | 1993 | 218.2 | R | |
| Roy Evans (28) | 19 | 1902 | 273.1 | R | |
| Bob Ewing (34) | 19 | 1907 | 332.2 | R | |
| Wes Ferrell (29) | 19 | 1937 | 281.0 | R | |
| Howie Fox (28) | 19 | 1949 | 215.0 | R | |
| Chick Fraser (23) | 19 | 1897 | 294.1 | R | |
| Larry French (30) | 19 | 1938 | 201.1 | L | |
| Bob Friend (28) | 19 | 1959 | 234.2 | R | |
| Bob Friend (30) | 19 | 1961 | 236.0 | R | |
| Sam Frock (27) | 19 | 1910 | 257.1 | R | |
| Wayne Garland (26) | 19 | 1977 | 282.2 | R | |
| Milt Gaston (33) | 19 | 1929 | 243.2 | R | |
| Milt Gaston (38) | 19 | 1934 | 194.0 | R | |
| Hank Gastright (26) | 19 | 1891 | 283.2 | R | |
| Joe Genewich (27) | 19 | 1924 | 200.1 | R | |
| Al Gerheauser (26) | 19 | 1943 | 215.0 | L | |
| Fred Goldsmith (27) | 19 | 1883 | 383.1 | R | |
| Dolly Gray (30) | 19 | 1909 | 218.0 | L | |
| Dolly Gray (31) | 19 | 1910 | 229.0 | L | |
| Bill Greif (24) | 19 | 1974 | 226.0 | R | |
| Burleigh Grimes+ (31) | 19 | 1925 | 246.2 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Bob Groom (32) | 19 | 1917 | 232.2 | R | |
| Ad Gumbert (24) | 19 | 1892 | 382.2 | R | |
| Warren Hacker (28) | 19 | 1953 | 221.2 | R | |
| George Haddock (22) | 19 | 1889 | 276.1 | R | |
| Noodles Hahn (22) | 19 | 1901 | 375.1 | L | |
| Jesse Haines+ (30) | 19 | 1924 | 222.2 | R | |
| George Hemming (25) | 19 | 1894 | 339.2 | R | |
| Hardie Henderson (23) | 19 | 1886 | 295.1 | R | |
| Kirby Higbe (25) | 19 | 1940 | 283.0 | R | |
| Elon Hogsett (33) | 19 | 1937 | 177.1 | L | |
| Jay Hook (25) | 19 | 1962 | 213.2 | R | |
| Bill Hutchison (31) | 19 | 1891 | 561.0 | R | |
| Elmer Jacobs (24) | 19 | 1917 | 227.1 | R | |
| Al Javery (26) | 19 | 1944 | 254.0 | R | |
| Si Johnson (24) | 19 | 1931 | 262.1 | R | |
| Si Johnson (35) | 19 | 1942 | 195.1 | R | |
| Bobby Jones (31) | 19 | 2001 | 195.0 | R | |
| Cowboy Jones (25) | 19 | 1900 | 292.2 | L | |
| George Kahler (22) | 19 | 1912 | 246.1 | R | |
| Ed Karger (23) | 19 | 1906 | 219.2 | L | |
| Ed Karger (24) | 19 | 1907 | 314.0 | L | |
| Tim Keefe+ (30) | 19 | 1887 | 476.2 | R | |
| Ted Kennedy (21) | 19 | 1886 | 204.2 | R | |
| Matt Kilroy (21) | 19 | 1887 | 589.1 | L | |
| Dave Koslo (26) | 19 | 1946 | 265.1 | L | |
| Gene Krapp (28) | 19 | 1915 | 231.0 | R | |
| Lerrin LaGrow (25) | 19 | 1974 | 216.1 | R | |
| Wayne LaMaster (30) | 19 | 1937 | 220.1 | L | |
| Rick Langford (25) | 19 | 1977 | 208.1 | R | |
| Tim Leary (31) | 19 | 1990 | 208.0 | R | |
| Dutch Leonard (31) | 19 | 1940 | 289.0 | R | |
| Mickey Lolich (29) | 19 | 1970 | 272.2 | L | |
| Albie Lopez (29) | 19 | 2001 | 205.2 | R | |
| Tom Lovett (27) | 19 | 1891 | 365.2 | R | |
| Dolf Luque (30) | 19 | 1921 | 304.0 | R | |
| Art Mahaffey (23) | 19 | 1961 | 219.1 | R | |
| Al Mattern (27) | 19 | 1910 | 305.0 | L | |
| Darrell May (32) | 19 | 2004 | 186.0 | L | |
| Erskine Mayer (24) | 19 | 1914 | 321.0 | R | |
| Kirk McCaskill (30) | 19 | 1991 | 177.2 | R | |
| Mike McDermott (20) | 19 | 1895 | 207.1 | R | |
| Chappie McFarland (28) | 19 | 1903 | 229.0 | R | |
| Willie McGill (20) | 19 | 1894 | 208.0 | L | |
| Frank Miller (31) | 19 | 1917 | 224.0 | R | |
| Al Milnar (27) | 19 | 1941 | 229.1 | L | |
| Sam Moffet (27) | 19 | 1884 | 197.2 | R | |
| Earl Moore (33) | 19 | 1911 | 308.1 | R | |
| Mike Moore (27) | 19 | 1987 | 231.0 | R | |
| Van Mungo (25) | 19 | 1936 | 311.2 | R | |
| Bobo Newsom (34) | 19 | 1942 | 245.2 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Kid Nichols+ (20) | 19 | 1890 | 424.0 | R | |
| Kid Nichols+ (29) | 19 | 1899 | 343.1 | R | |
| Darby O'Brien (21) | 19 | 1888 | 259.0 | R | |
| Al Orth (24) | 19 | 1897 | 282.1 | R | |
| Tom Parrott (26) | 19 | 1894 | 308.2 | R | |
| Gaylord Perry+ (34) | 19 | 1973 | 344.0 | R | |
| Scott Perry (27) | 19 | 1918 | 332.1 | R | |
| Herman Pillette (27) | 19 | 1923 | 250.1 | R | |
| Henry Porter (28) | 19 | 1886 | 424.0 | R | |
| Jack Powell (24) | 19 | 1899 | 373.0 | R | |
| Jack Powell (26) | 19 | 1901 | 338.1 | R | |
| Jack Powell (28) | 19 | 1903 | 306.1 | R | |
| Jack Powell (29) | 19 | 1904 | 390.1 | R | |
| Jack Powell (36) | 19 | 1911 | 207.2 | R | |
| Old Hoss Radbourn+ (27) | 19 | 1882 | 466.0 | R | |
| Ken Raffensberger (32) | 19 | 1950 | 239.0 | L | |
| Pedro Ramos (24) | 19 | 1959 | 233.2 | R | |
| Jimmy Ring (26) | 19 | 1921 | 246.0 | R | |
| Eddie Rommel (25) | 19 | 1923 | 297.2 | R | |
| Nap Rucker (23) | 19 | 1908 | 333.1 | L | |
| Nap Rucker (24) | 19 | 1909 | 309.1 | L | |
| Dick Rudolph (27) | 19 | 1915 | 341.1 | R | |
| Don Rudolph (31) | 19 | 1963 | 174.0 | L | |
| Ben Sanders (27) | 19 | 1892 | 268.1 | R | |
| Pete Schneider (19) | 19 | 1915 | 275.2 | R | |
| Pete Schneider (20) | 19 | 1916 | 274.1 | R | |
| Pete Schneider (21) | 19 | 1917 | 333.2 | R | |
| Al Schulz (27) | 19 | 1916 | 215.0 | L | |
| Ed Seward (21) | 19 | 1888 | 518.2 | R | |
| Cy Seymour (25) | 19 | 1898 | 356.2 | L | |
| James Shields (34) | 19 | 2016 | 181.2 | R | |
| Allen Sothoron (24) | 19 | 1917 | 276.2 | R | |
| Warren Spahn+ (31) | 19 | 1952 | 290.0 | L | |
| Tully Sparks (27) | 19 | 1902 | 265.2 | R | |
| Paul Splittorff (27) | 19 | 1974 | 226.0 | L | |
| Bill Steele (24) | 19 | 1911 | 287.1 | R | |
| Lefty Stewart (31) | 19 | 1932 | 259.2 | L | |
| Bill Stoneman (25) | 19 | 1969 | 235.2 | R | |
| Scott Stratton (22) | 19 | 1892 | 351.2 | R | |
| Jack Sutthoff (31) | 19 | 1904 | 253.2 | R | |
| Frank Tanana (20) | 19 | 1974 | 268.2 | L | |
| Jack Taylor (27) | 19 | 1901 | 275.2 | R | |
| Jack Taylor (30) | 19 | 1904 | 352.0 | R | |
| Jim Tobin (31) | 19 | 1944 | 299.1 | R | |
| Jim Tobin (32) | 19 | 1945 | 255.0 | R | |
| Virgil Trucks (35) | 19 | 1952 | 197.0 | R | |
| Rube Vickers (29) | 19 | 1908 | 317.0 | R | |
| Rube Waddell+ (27) | 19 | 1904 | 383.0 | L | |
| John Ward+ (19) | 19 | 1879 | 587.0 | R | |
| Jack Warhop (27) | 19 | 1912 | 258.0 | R | |
| Rank | Player (age that year) | Losses | Year | IP | Throws |
| Carl Weilman (23) | 19 | 1913 | 251.2 | L | |
| Carl Weilman (25) | 19 | 1915 | 295.2 | L | |
| Mickey Welch+ (28) | 19 | 1888 | 425.1 | R | |
| Lewis Wiltse (30) | 19 | 1902 | 302.0 | L | |
| Ted Wingfield (25) | 19 | 1925 | 254.1 | R | |
| George Winter (30) | 19 | 1908 | 204.0 | R | |
| Rick Wise (32) | 19 | 1978 | 211.2 | R | |
| Wilbur Wood (32) | 19 | 1974 | 320.1 | L | |
| Clyde Wright (32) | 19 | 1973 | 257.0 | L | |
| Early Wynn+ (28) | 19 | 1948 | 198.0 | R | |
| Cy Young+ (30) | 19 | 1897 | 335.2 | R | |
| Cy Young+ (38) | 19 | 1905 | 320.2 | R | |
| Matt Young (26) | 19 | 1985 | 218.1 | L |
