Create Custom Leaderboards
The Baseball-Reference.com Play Index's Batting Season Finder lets you create your own custom leaderboards by team, age, position, years, or any other common criteria. View Sample Leaderboards created with the batting season finder.
Single-Season Leaders & Records for Adjusted ERA+
Baseball Leaders & Baseball Records:
Single-Season
Career
Active
Progressive
Year-by-Year League
Click on the Player for career stats and accomplishments.
+ - Indicates Hall of Famer. Bold indicates active player
* - throws left-handed, ? - unknown, else - throws right-handed
Only players who finished in the top 40 for the majors in a season will appear on this list. Leaders from the current season are only included for rate stats after July 1st.
Minimum of 3.1 PA/G, 1.0 IP/G, and 0.1 decision/G for single-season leaderboards generally needed for rate statistics. Explanation of min. requirements
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| 1. | Tim Keefe+ (23) | 294 | 1880 | R |
| 2. | Pedro Martinez (28) | 291 | 2000 | R |
| 3. | Dutch Leonard* (22) | 279 | 1914 | L |
| 4. | Greg Maddux (28) | 271 | 1994 | R |
| 5. | Greg Maddux (29) | 262 | 1995 | R |
| 6. | Walter Johnson+ (25) | 259 | 1913 | R |
| 7. | Bob Gibson+ (32) | 258 | 1968 | R |
| 8. | Mordecai Brown+ (29) | 253 | 1906 | R |
| 9. | Pedro Martinez (27) | 243 | 1999 | R |
| 10. | Walter Johnson+ (24) | 242 | 1912 | R |
| 11. | Christy Mathewson+ (24) | 230 | 1905 | R |
| 12. | Dwight Gooden (20) | 228 | 1985 | R |
| 13. | Roger Clemens (42) | 226 | 2005 | R |
| 14. | Pete Alexander+ (28) | 225 | 1915 | R |
| 15. | Christy Mathewson+ (28) | 222 | 1909 | R |
| 16. | Roger Clemens (34) | 221 | 1997 | R |
| 17. | Denny Driscoll* (26) | 220 | 1882 | L |
| 18. | Lefty Grove+* (31) | 219 | 1931 | L |
| Pedro Martinez (25) | 219 | 1997 | R | |
| 20. | Kevin Brown (31) | 216 | 1996 | R |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Jack Pfiester* (29) | 216 | 1907 | L | |
| Cy Young+ (34) | 216 | 1901 | R | |
| 23. | Walter Johnson+ (30) | 214 | 1918 | R |
| Walter Johnson+ (31) | 214 | 1919 | R | |
| 25. | Roger Clemens (27) | 213 | 1990 | R |
| 26. | Carl Lundgren (27) | 212 | 1907 | R |
| 27. | Pedro Martinez (31) | 210 | 2003 | R |
| 28. | Ed Reulbach (22) | 209 | 1905 | R |
| 29. | Ron Guidry* (27) | 208 | 1978 | L |
| 30. | Addie Joss+ (28) | 205 | 1908 | R |
| Charley Radbourn+ (29) | 205 | 1884 | R | |
| 32. | Pedro Martinez (30) | 202 | 2002 | R |
| Jack Taylor (28) | 202 | 1902 | R | |
| 34. | Dolf Luque (32) | 201 | 1923 | R |
| Billy Pierce* (28) | 201 | 1955 | L | |
| 36. | Dean Chance (23) | 198 | 1964 | R |
| 37. | Spud Chandler (35) | 197 | 1943 | R |
| Randy Johnson* (38) | 197 | 2002 | L | |
| Silver King (20) | 197 | 1888 | R | |
| Al Maul (29) | 197 | 1895 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| 41. | Randy Johnson* (33) | 196 | 1997 | L |
| Ed Siever* (27) | 196 | 1902 | L | |
| 43. | Hal Newhouser+* (24) | 195 | 1945 | L |
| 44. | Mort Cooper (29) | 194 | 1942 | R |
| Nolan Ryan+ (34) | 194 | 1981 | R | |
| Cy Young+ (41) | 194 | 1908 | R | |
| 47. | Mordecai Brown+ (32) | 193 | 1909 | R |
| Carl Hubbell+* (30) | 193 | 1933 | L | |
| Tom Seaver+ (26) | 193 | 1971 | R | |
| 50. | Guy Hecker (26) | 192 | 1882 | R |
| Randy Johnson* (31) | 192 | 1995 | L | |
| Monty Stratton (25) | 192 | 1937 | R | |
| 53. | Lefty Gomez+* (28) | 191 | 1937 | L |
| Walter Johnson+ (27) | 191 | 1915 | R | |
| Dazzy Vance+ (37) | 191 | 1928 | R | |
| 56. | Clark Griffith+ (28) | 190 | 1898 | R |
| Sandy Koufax+* (30) | 190 | 1966 | L | |
| 58. | Vean Gregg* (26) | 189 | 1911 | L |
| Greg Maddux (31) | 189 | 1997 | R | |
| Amos Rusie+ (23) | 189 | 1894 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Dazzy Vance+ (39) | 189 | 1930 | R | |
| Ed Walsh+ (29) | 189 | 1910 | R | |
| 63. | Lefty Grove+* (36) | 188 | 1936 | L |
| Randy Johnson* (37) | 188 | 2001 | L | |
| Hal Newhouser+* (25) | 188 | 1946 | L | |
| Billy Rhines (27) | 188 | 1896 | R | |
| Warren Spahn+* (32) | 188 | 1953 | L | |
| Jack Stivetts (21) | 188 | 1889 | R | |
| Wilbur Wood* (29) | 188 | 1971 | L | |
| 70. | Sandy Koufax+* (28) | 187 | 1964 | L |
| Greg Maddux (32) | 187 | 1998 | R | |
| Joe Wood (25) | 187 | 1915 | R | |
| 73. | Eddie Cicotte (29) | 186 | 1913 | R |
| Randy Johnson* (35) | 186 | 1999 | L | |
| Luis Tiant (27) | 186 | 1968 | R | |
| 76. | Vida Blue* (21) | 185 | 1971 | L |
| Lefty Grove+* (30) | 185 | 1930 | L | |
| Lefty Grove+* (39) | 185 | 1939 | L | |
| 79. | Billy Rhines (21) | 184 | 1890 | R |
| John Tudor* (31) | 184 | 1985 | L | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| 81. | Hank Aguirre* (31) | 183 | 1962 | L |
| Joe Horlen (26) | 183 | 1964 | R | |
| Walter Johnson+ (22) | 183 | 1910 | R | |
| 84. | Harry Brecheen* (33) | 182 | 1948 | L |
| Steve Carlton+* (27) | 182 | 1972 | L | |
| Jack Coombs (27) | 182 | 1910 | R | |
| Johan Santana* (25) | 182 | 2004 | L | |
| 88. | Henry Boyle (25) | 181 | 1886 | R |
| Russ Ford (31) | 181 | 1914 | R | |
| Randy Johnson* (36) | 181 | 2000 | L | |
| Fred Toney (26) | 181 | 1915 | R | |
| 92. | Bret Saberhagen (25) | 180 | 1989 | R |
| 93. | Kevin Appier (25) | 179 | 1993 | R |
| Mordecai Brown+ (30) | 179 | 1907 | R | |
| Phil Niekro+ (28) | 179 | 1967 | R | |
| Jason Schmidt (30) | 179 | 2003 | R | |
| Rube Waddell+* (25) | 179 | 1902 | L | |
| Rube Waddell+* (28) | 179 | 1905 | L | |
| 99. | Marvin Freeman (31) | 178 | 1994 | R |
| Max Lanier* (27) | 178 | 1943 | L | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Orval Overall (28) | 178 | 1909 | R | |
| Mark Prior (22) | 178 | 2003 | R | |
| Joe Wood (22) | 178 | 1912 | R | |
| 104. | Johnny Antonelli* (24) | 177 | 1954 | L |
| Roger Clemens (31) | 177 | 1994 | R | |
| Randy Johnson* (40) | 177 | 2004 | L | |
| Andy Pettitte* (33) | 177 | 2005 | L | |
| 108. | Johnny Allen (32) | 176 | 1937 | R |
| Fred Anderson (31) | 176 | 1917 | R | |
| Whitey Ford+* (29) | 176 | 1958 | L | |
| Derek Lowe (29) | 176 | 2002 | R | |
| Cy Young+ (25) | 176 | 1892 | R | |
| 113. | Al Benton (34) | 175 | 1945 | R |
| Eddie Cicotte (35) | 175 | 1919 | R | |
| Roger Clemens (29) | 175 | 1992 | R | |
| Lefty Gomez+* (25) | 175 | 1934 | L | |
| Lefty Grove+* (35) | 175 | 1935 | L | |
| Harry McCormick (26) | 175 | 1882 | R | |
| Tom Seaver+ (28) | 175 | 1973 | R | |
| 120. | Eddie Cicotte (33) | 174 | 1917 | R |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Roger Clemens (35) | 174 | 1998 | R | |
| Claude Hendrix (25) | 174 | 1914 | R | |
| Jack Pfiester* (28) | 174 | 1906 | L | |
| Dazzy Vance+ (33) | 174 | 1924 | R | |
| 125. | George Bradley (23) | 173 | 1876 | R |
| Jim Devlin (27) | 173 | 1876 | R | |
| Tim Keefe+ (28) | 173 | 1885 | R | |
| Thornton Lee* (34) | 173 | 1941 | L | |
| Ted Lyons+ (41) | 173 | 1942 | R | |
| Dave Righetti* (22) | 173 | 1981 | L | |
| Jeff Tesreau (24) | 173 | 1912 | R | |
| Will White (27) | 173 | 1882 | R | |
| Hoyt Wilhelm+ (36) | 173 | 1959 | R | |
| 134. | Walter Johnson+ (23) | 172 | 1911 | R |
| Harry Krause* (20) | 172 | 1909 | L | |
| Kid Nichols+ (28) | 172 | 1898 | R | |
| Dave Stieb (27) | 172 | 1985 | R | |
| 138. | Henry Boyle (23) | 171 | 1884 | R |
| Jeff D'Amico (24) | 171 | 2000 | R | |
| Red Faber+ (32) | 171 | 1921 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Juan Guzman (29) | 171 | 1996 | R | |
| Mel Harder (24) | 171 | 1934 | R | |
| Guy Hecker (28) | 171 | 1884 | R | |
| Ted Lyons+ (38) | 171 | 1939 | R | |
| Greg Maddux (27) | 171 | 1993 | R | |
| Jake Peavy (23) | 171 | 2004 | R | |
| Charlie Sweeney (21) | 171 | 1884 | R | |
| 148. | Pete Alexander+ (29) | 170 | 1916 | R |
| David Cone (31) | 170 | 1994 | R | |
| Whitey Ford+* (35) | 170 | 1964 | L | |
| Noodles Hahn* (23) | 170 | 1902 | L | |
| Orel Hershiser (26) | 170 | 1985 | R | |
| Al Leiter* (32) | 170 | 1998 | L | |
| Al Maul (32) | 170 | 1898 | R | |
| Jim McCormick (26) | 170 | 1883 | R | |
| Kid Nichols+ (27) | 170 | 1897 | R | |
| Gaylord Perry+ (33) | 170 | 1972 | R | |
| Ernie Shore (24) | 170 | 1915 | R | |
| Luis Tiant (31) | 170 | 1972 | R | |
| 160. | Kevin Brown (35) | 169 | 2000 | R |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Kevin Brown (38) | 169 | 2003 | R | |
| John Candelaria* (23) | 169 | 1977 | L | |
| Roger Clemens (23) | 169 | 1986 | R | |
| Mike Garcia (25) | 169 | 1949 | R | |
| Carl Hubbell+* (33) | 169 | 1936 | L | |
| Juan Marichal+ (27) | 169 | 1965 | R | |
| Rube Marquard+* (29) | 169 | 1916 | L | |
| Joe McGinnity+ (33) | 169 | 1904 | R | |
| Jim Palmer+ (29) | 169 | 1975 | R | |
| 170. | Pete Alexander+ (33) | 168 | 1920 | R |
| Danny Darwin (34) | 168 | 1990 | R | |
| Tom Glavine* (32) | 168 | 1998 | L | |
| Carl Hubbell+* (31) | 168 | 1934 | L | |
| Juan Marichal+ (31) | 168 | 1969 | R | |
| Christy Mathewson+ (27) | 168 | 1908 | R | |
| Christy Mathewson+ (30) | 168 | 1911 | R | |
| Wilcy Moore (30) | 168 | 1927 | R | |
| Kid Nichols+ (20) | 168 | 1890 | R | |
| Warren Spahn+* (26) | 168 | 1947 | L | |
| Dizzy Trout (29) | 168 | 1944 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Bucky Walters (30) | 168 | 1939 | R | |
| Doc White* (27) | 168 | 1906 | L | |
| 183. | Pete Alexander+ (32) | 167 | 1919 | R |
| Gene Bearden* (27) | 167 | 1948 | L | |
| Dick Ellsworth* (23) | 167 | 1963 | L | |
| Juan Marichal+ (28) | 167 | 1966 | R | |
| Jon Matlack* (28) | 167 | 1978 | L | |
| Kevin Millwood (24) | 167 | 1999 | R | |
| Bobo Newsom (32) | 167 | 1940 | R | |
| Steve Ontiveros (33) | 167 | 1994 | R | |
| Ed Walsh+ (28) | 167 | 1909 | R | |
| Vic Willis+ (23) | 167 | 1899 | R | |
| 193. | Allan Anderson* (24) | 166 | 1988 | L |
| Ewell Blackwell (24) | 166 | 1947 | R | |
| Lefty Grove+* (26) | 166 | 1926 | L | |
| Ray Kremer (34) | 166 | 1927 | R | |
| Greg Maddux (26) | 166 | 1992 | R | |
| Herb Score* (23) | 166 | 1956 | L | |
| Cy Young+ (35) | 166 | 1902 | R | |
| 200. | Kevin Appier (24) | 165 | 1992 | R |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Buzz Capra (26) | 165 | 1974 | R | |
| Spud Chandler (38) | 165 | 1946 | R | |
| John Clarkson+ (23) | 165 | 1885 | R | |
| Sam McDowell* (25) | 165 | 1968 | L | |
| Tom Seaver+ (24) | 165 | 1969 | R | |
| Rube Waddell+* (27) | 165 | 1904 | L | |
| Tim Wakefield (28) | 165 | 1995 | R | |
| Brandon Webb (24) | 165 | 2003 | R | |
| 209. | Kevin Brown (33) | 164 | 1998 | R |
| Steve Carlton+* (24) | 164 | 1969 | L | |
| Roger Clemens (28) | 164 | 1991 | R | |
| Stan Coveleski+ (28) | 164 | 1918 | R | |
| Charlie Ferguson (23) | 164 | 1886 | R | |
| Bob Gibson+ (33) | 164 | 1969 | R | |
| Tim Hudson (27) | 164 | 2003 | R | |
| Walter Johnson+ (26) | 164 | 1914 | R | |
| Jimmy Key* (26) | 164 | 1987 | L | |
| Howie Pollet* (25) | 164 | 1946 | L | |
| Bill Walker* (27) | 164 | 1931 | L | |
| Ed Walsh+ (27) | 164 | 1908 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Mickey Welch+ (25) | 164 | 1885 | R | |
| 222. | Dick Donovan (33) | 163 | 1961 | R |
| Dave Foutz (29) | 163 | 1886 | R | |
| Vern Law (35) | 163 | 1965 | R | |
| Pedro Martinez (26) | 163 | 1998 | R | |
| Earl Moore (23) | 163 | 1903 | R | |
| Mike Mussina (25) | 163 | 1994 | R | |
| Barney Pelty (25) | 163 | 1906 | R | |
| Jose Rijo (28) | 163 | 1993 | R | |
| Amos Rusie+ (26) | 163 | 1897 | R | |
| Lon Warneke (24) | 163 | 1933 | R | |
| 232. | Johnny Beazley (24) | 162 | 1942 | R |
| Steve Carlton+* (35) | 162 | 1980 | L | |
| Bill Doak (23) | 162 | 1914 | R | |
| Bill Hands (29) | 162 | 1969 | R | |
| Teddy Higuera* (29) | 162 | 1988 | L | |
| Silver King (22) | 162 | 1890 | R | |
| Greg Maddux (30) | 162 | 1996 | R | |
| Allie Reynolds (35) | 162 | 1952 | R | |
| Elmer Riddle (26) | 162 | 1941 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Ben Sheets (25) | 162 | 2004 | R | |
| Scott Stratton (20) | 162 | 1890 | R | |
| Tim Wakefield (35) | 162 | 2002 | R | |
| Stump Wiedman (20) | 162 | 1881 | R | |
| Joe Wood (21) | 162 | 1911 | R | |
| 246. | Bob Feller+ (21) | 161 | 1940 | R |
| Jocko Flynn (22) | 161 | 1886 | R | |
| Tommy John* (25) | 161 | 1968 | L | |
| Sam McDowell* (22) | 161 | 1965 | L | |
| Tony Mullane (31) | 161 | 1890 | R | |
| Hal Newhouser+* (21) | 161 | 1942 | L | |
| Hal Newhouser+* (23) | 161 | 1944 | L | |
| Gary Nolan (24) | 161 | 1972 | R | |
| Johan Santana* (27) | 161 | 2006 | L | |
| Mike Scott (31) | 161 | 1986 | R | |
| Don Sutton+ (27) | 161 | 1972 | R | |
| Hippo Vaughn* (30) | 161 | 1918 | L | |
| Hippo Vaughn* (31) | 161 | 1919 | L | |
| 259. | Bill Bernhard (31) | 160 | 1902 | R |
| George Bradley (27) | 160 | 1880 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Mordecai Brown+ (31) | 160 | 1908 | R | |
| Mike Caldwell* (29) | 160 | 1978 | L | |
| Curt Davis (30) | 160 | 1934 | R | |
| Russ Ford (27) | 160 | 1910 | R | |
| Lefty Grove+* (38) | 160 | 1938 | L | |
| Addie Joss+ (24) | 160 | 1904 | R | |
| Jerry Koosman* (26) | 160 | 1969 | L | |
| Dave Koslo* (29) | 160 | 1949 | L | |
| Sandy Koufax+* (29) | 160 | 1965 | L | |
| Joe Magrane* (23) | 160 | 1988 | L | |
| Christy Mathewson+ (31) | 160 | 1912 | R | |
| Tony Mullane (24) | 160 | 1883 | R | |
| Kid Nichols+ (26) | 160 | 1896 | R | |
| Gary Peters* (29) | 160 | 1966 | L | |
| Don Sutton+ (35) | 160 | 1980 | R | |
| Carl Weilman* (29) | 160 | 1919 | L | |
| Carlos Zambrano (23) | 160 | 2004 | R | |
| 278. | Cy Blanton (26) | 159 | 1935 | R |
| Garland Braxton* (28) | 159 | 1928 | L | |
| Tom Candiotti (33) | 159 | 1991 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| King Cole (24) | 159 | 1910 | R | |
| David Cone (34) | 159 | 1997 | R | |
| Dizzy Dean+ (24) | 159 | 1934 | R | |
| Ned Garvin (28) | 159 | 1902 | R | |
| Lefty Grove+* (32) | 159 | 1932 | L | |
| Atlee Hammaker* (25) | 159 | 1983 | L | |
| Sandy Koufax+* (27) | 159 | 1963 | L | |
| Esteban Loaiza (31) | 159 | 2003 | R | |
| Greg Maddux (36) | 159 | 2002 | R | |
| Rudy May* (35) | 159 | 1980 | L | |
| Phil Niekro+ (35) | 159 | 1974 | R | |
| Jake Peavy (26) | 159 | 2007 | R | |
| Ed Reulbach (23) | 159 | 1906 | R | |
| Curt Schilling (36) | 159 | 2003 | R | |
| Bobby Shantz* (26) | 159 | 1952 | L | |
| Bill Swift (30) | 159 | 1992 | R | |
| Frank Viola* (27) | 159 | 1987 | L | |
| Lon Warneke (23) | 159 | 1932 | R | |
| 299. | Bert Blyleven (22) | 158 | 1973 | R |
| Bob Bowman (28) | 158 | 1939 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Howie Camnitz (27) | 158 | 1909 | R | |
| Bob Caruthers (21) | 158 | 1885 | R | |
| Mark Fidrych (21) | 158 | 1976 | R | |
| Chuck Finley* (27) | 158 | 1990 | L | |
| Rube Foster (26) | 158 | 1914 | R | |
| Ned Garvin (30) | 158 | 1904 | R | |
| Lefty Grove+* (37) | 158 | 1937 | L | |
| Roy Halladay (25) | 158 | 2002 | R | |
| Willie Mitchell* (23) | 158 | 1913 | L | |
| Rick Reuschel (36) | 158 | 1985 | R | |
| Babe Ruth+* (21) | 158 | 1916 | L | |
| Barry Zito* (24) | 158 | 2002 | L | |
| 313. | Pete Alexander+ (40) | 157 | 1927 | R |
| Dick Bosman (25) | 157 | 1969 | R | |
| Ray Collins* (23) | 157 | 1910 | L | |
| Russ Ford (28) | 157 | 1911 | R | |
| Sam Leever (31) | 157 | 1903 | R | |
| Dutch Leonard (39) | 157 | 1948 | R | |
| George McQuillan (23) | 157 | 1908 | R | |
| Mike Mussina (23) | 157 | 1992 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Mel Parnell* (27) | 157 | 1949 | L | |
| Rick Reuschel (28) | 157 | 1977 | R | |
| Dave Roberts* (26) | 157 | 1971 | L | |
| Curt Schilling (34) | 157 | 2001 | R | |
| Chris Short* (26) | 157 | 1964 | L | |
| Bob Tewksbury (31) | 157 | 1992 | R | |
| Ernie White* (24) | 157 | 1941 | L | |
| Whit Wyatt (33) | 157 | 1941 | R | |
| 329. | Sheriff Blake (28) | 156 | 1928 | R |
| Stan Coveleski+ (27) | 156 | 1917 | R | |
| Cy Falkenberg (33) | 156 | 1914 | R | |
| Whitey Ford+* (27) | 156 | 1956 | L | |
| Juan Guzman (25) | 156 | 1992 | R | |
| Teddy Higuera* (27) | 156 | 1986 | L | |
| Randy Jones* (25) | 156 | 1975 | L | |
| Tim Keefe+ (31) | 156 | 1888 | R | |
| Darryl Kile (28) | 156 | 1997 | R | |
| Dolf Luque (34) | 156 | 1925 | R | |
| Christy Mathewson+ (29) | 156 | 1910 | R | |
| Jim Palmer+ (27) | 156 | 1973 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Johnny Podres* (24) | 156 | 1957 | L | |
| Johnny Sain (28) | 156 | 1946 | R | |
| Bob Shawkey (29) | 156 | 1920 | R | |
| Sammy Stewart (26) | 156 | 1981 | R | |
| Brandon Webb (28) | 156 | 2007 | R | |
| Will White (28) | 156 | 1883 | R | |
| 347. | Bill Bevens (29) | 155 | 1946 | R |
| Ralph Branca (21) | 155 | 1947 | R | |
| Mordecai Brown+ (33) | 155 | 1910 | R | |
| Eddie Cicotte (32) | 155 | 1916 | R | |
| Jesse Duryea (29) | 155 | 1889 | R | |
| Pud Galvin+ (27) | 155 | 1884 | R | |
| Dave Goltz (29) | 155 | 1978 | R | |
| Lefty Grove+* (28) | 155 | 1928 | L | |
| Pat Hentgen (27) | 155 | 1996 | R | |
| Andy Pettitte* (25) | 155 | 1997 | L | |
| Ben Sanders (23) | 155 | 1888 | R | |
| Johan Santana* (26) | 155 | 2005 | L | |
| Dizzy Trout (31) | 155 | 1946 | R | |
| 360. | Charlie Buffinton (27) | 154 | 1888 | R |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Roger Clemens (24) | 154 | 1987 | R | |
| Don Drysdale+ (20) | 154 | 1957 | R | |
| Bob Feller+ (20) | 154 | 1939 | R | |
| Mike Hampton* (26) | 154 | 1999 | L | |
| Randy Johnson* (30) | 154 | 1994 | L | |
| Charlie Leibrandt* (28) | 154 | 1985 | L | |
| Denny McLain (24) | 154 | 1968 | R | |
| Jim Palmer+ (23) | 154 | 1969 | R | |
| Reb Russell* (24) | 154 | 1913 | L | |
| Ray Scarborough (30) | 154 | 1948 | R | |
| Jim Scott (25) | 154 | 1913 | R | |
| Frank Tanana* (23) | 154 | 1977 | L | |
| Bucky Walters (31) | 154 | 1940 | R | |
| Vic Willis+ (30) | 154 | 1906 | R | |
| Early Wynn+ (36) | 154 | 1956 | R | |
| Cy Young+ (28) | 154 | 1895 | R | |
| 377. | Babe Adams (37) | 153 | 1919 | R |
| Pete Alexander+ (30) | 153 | 1917 | R | |
| Lady Baldwin* (26) | 153 | 1885 | L | |
| Steve Carlton+* (32) | 153 | 1977 | L | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| John Clarkson+ (27) | 153 | 1889 | R | |
| Mike Cuellar* (29) | 153 | 1966 | L | |
| Phil Douglas (32) | 153 | 1922 | R | |
| Bob Feller+ (27) | 153 | 1946 | R | |
| Tom Glavine* (25) | 153 | 1991 | L | |
| Ed Lopat* (35) | 153 | 1953 | L | |
| Ted Lyons+ (34) | 153 | 1935 | R | |
| Greg Maddux (34) | 153 | 2000 | R | |
| Dennis Martinez (36) | 153 | 1991 | R | |
| Stu Miller (30) | 153 | 1958 | R | |
| Cy Morgan (31) | 153 | 1910 | R | |
| Eddie Plank+* (39) | 153 | 1915 | L | |
| Jose Rijo (26) | 153 | 1991 | R | |
| Frank Viola* (28) | 153 | 1988 | L | |
| Rube Waddell+* (23) | 153 | 1900 | L | |
| Vic Willis+ (25) | 153 | 1901 | R | |
| Cy Young+ (32) | 153 | 1899 | R | |
| 398. | Al Benton (30) | 152 | 1941 | R |
| Stan Coveleski+ (30) | 152 | 1920 | R | |
| John Denny (30) | 152 | 1983 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Jesse Flores (31) | 152 | 1946 | R | |
| Burleigh Grimes+ (35) | 152 | 1929 | R | |
| Mel Harder (23) | 152 | 1933 | R | |
| Dennis Martinez (40) | 152 | 1995 | R | |
| Christy Mathewson+ (32) | 152 | 1913 | R | |
| Dave McNally* (25) | 152 | 1968 | L | |
| Kid Nichols+ (21) | 152 | 1891 | R | |
| Ray Prim* (38) | 152 | 1945 | L | |
| Charley Radbourn+ (28) | 152 | 1883 | R | |
| Robin Roberts+ (26) | 152 | 1953 | R | |
| Preacher Roe* (33) | 152 | 1948 | L | |
| Steve Rogers (32) | 152 | 1982 | R | |
| Dutch Ruether* (25) | 152 | 1919 | L | |
| Bret Saberhagen (30) | 152 | 1994 | R | |
| Jerry Staley (28) | 152 | 1949 | R | |
| Bill Swift (27) | 152 | 1935 | R | |
| Fred Toney (30) | 152 | 1919 | R | |
| Doc Watson* (28) | 152 | 1914 | L | |
| Brandon Webb (27) | 152 | 2006 | R | |
| Hoyt Wilhelm+ (29) | 152 | 1952 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Joe Wood (20) | 152 | 1910 | R | |
| 422. | Bert Blyleven (26) | 151 | 1977 | R |
| Tiny Bonham (28) | 151 | 1942 | R | |
| Fausto Carmona (23) | 151 | 2007 | R | |
| Mike Cuellar* (32) | 151 | 1969 | L | |
| Larry Dierker (22) | 151 | 1969 | R | |
| Red Ehret (21) | 151 | 1890 | R | |
| Bob Gibson+ (26) | 151 | 1962 | R | |
| Lefty Grove+* (29) | 151 | 1929 | L | |
| Joe Haynes (29) | 151 | 1947 | R | |
| Addie Joss+ (26) | 151 | 1906 | R | |
| Ray Kremer (33) | 151 | 1926 | R | |
| John Lackey (28) | 151 | 2007 | R | |
| Sal Maglie (33) | 151 | 1950 | R | |
| Doc McJames (23) | 151 | 1898 | R | |
| Claude Passeau (31) | 151 | 1940 | R | |
| Brad Penny (29) | 151 | 2007 | R | |
| Eddie Plank+* (35) | 151 | 1911 | L | |
| Nap Rucker* (27) | 151 | 1912 | L | |
| Allen Sothoron (26) | 151 | 1919 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Billy Taylor (29) | 151 | 1884 | R | |
| Adonis Terry (23) | 151 | 1888 | R | |
| Justin Thompson* (24) | 151 | 1997 | L | |
| Jim Turner (33) | 151 | 1937 | R | |
| Wayne Twitchell (25) | 151 | 1973 | R | |
| Ed Walsh+ (26) | 151 | 1907 | R | |
| Perry Werden (18) | 151 | 1884 | R | |
| Dontrelle Willis* (23) | 151 | 2005 | L | |
| 449. | Babe Adams (38) | 150 | 1920 | R |
| Bobby Bolin (29) | 150 | 1968 | R | |
| Kevin Brown (32) | 150 | 1997 | R | |
| Steve Carlton+* (36) | 150 | 1981 | L | |
| John Clarkson+ (24) | 150 | 1886 | R | |
| Dennis Eckersley+ (24) | 150 | 1979 | R | |
| Dave Foutz (27) | 150 | 1884 | R | |
| Ned Garvin (26) | 150 | 1900 | R | |
| Tex Hughson (28) | 150 | 1944 | R | |
| Bill James (22) | 150 | 1914 | R | |
| Bob Knepper* (27) | 150 | 1981 | L | |
| Dutch Leonard (38) | 150 | 1947 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Steve McCatty (27) | 150 | 1981 | R | |
| Jumbo McGinnis? (29) | 150 | 1883 | ||
| Hideo Nomo (26) | 150 | 1995 | R | |
| Jim Palmer+ (26) | 150 | 1972 | R | |
| Howie Pollet* (28) | 150 | 1949 | L | |
| Jose Rijo (23) | 150 | 1988 | R | |
| Curt Schilling (25) | 150 | 1992 | R | |
| Curt Schilling (37) | 150 | 2004 | R | |
| Tom Seaver+ (32) | 150 | 1977 | R | |
| Jesse Tannehill* (26) | 150 | 1901 | L | |
| Ed Walsh+ (31) | 150 | 1912 | R | |
| 472. | Johnny Allen (31) | 149 | 1936 | R |
| Chief Bender+ (26) | 149 | 1910 | R | |
| Harry Brecheen* (30) | 149 | 1945 | L | |
| Ernie Broglio (24) | 149 | 1960 | R | |
| Jim Bunning+ (35) | 149 | 1967 | R | |
| Chris Carpenter (30) | 149 | 2005 | R | |
| Don Drysdale+ (27) | 149 | 1964 | R | |
| Bob Ewing (34) | 149 | 1907 | R | |
| Lefty Gomez+* (22) | 149 | 1931 | L | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| Mark Gubicza (25) | 149 | 1988 | R | |
| Warren Hacker (27) | 149 | 1952 | R | |
| Guy Hecker (29) | 149 | 1885 | R | |
| Bill Hoffer (24) | 149 | 1895 | R | |
| Carl Hubbell+* (29) | 149 | 1932 | L | |
| Walter Johnson+ (36) | 149 | 1924 | R | |
| Addie Joss+ (29) | 149 | 1909 | R | |
| Dennis Lamp (28) | 149 | 1981 | R | |
| Jon Matlack* (24) | 149 | 1974 | L | |
| Andy Messersmith (29) | 149 | 1975 | R | |
| Earl Moseley (27) | 149 | 1915 | R | |
| Al Orth (28) | 149 | 1901 | R | |
| Roy Oswalt (28) | 149 | 2006 | R | |
| Camilo Pascual (25) | 149 | 1959 | R | |
| Camilo Pascual (29) | 149 | 1963 | R | |
| Gary Peters* (26) | 149 | 1963 | L | |
| Jack Powell (22) | 149 | 1897 | R | |
| Toad Ramsey* (21) | 149 | 1886 | L | |
| Red Ruffing+ (32) | 149 | 1937 | R | |
| Ed Seward (21) | 149 | 1888 | R | |
| Rank | Player (age that year) | Adjusted ERA+ | Year | Throws |
| John Smoltz (29) | 149 | 1996 | R | |
| John Tudor* (34) | 149 | 1988 | L | |
| Bob Welch (28) | 149 | 1985 | R |
Note that seasons prior to 1876 are not included in single-season marks, but are included in career marks.
Stats updated through May 10, 2008.
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