American League Pitching Leaders

Wins Above Replacement--all

<strong>Wins Above Replacement</strong><br>A single number that presents the number of wins the player added<br>to the team above what a replacement player (think AAA or AAAA) would add.<br>Scale for a single-season: 8+ MVP Quality, 5+ All-Star Quality, 2+ Starter,<br>0-2 Reserve, < 0 Replacement Level <br>Developed by Sean Smith of BaseballProjection.com

1. Yastrzemski • BOS 12.4
2. Robinson • BAL 7.7
3. Kaline • DET 7.5
4. Blair • BAL 6.8
5. Merritt • MIN 6.5
6. Killebrew • MIN 6.4
7. Freehan • DET 6.0
8. Horlen • CHW 5.6
9. Boswell • MIN 5.4
10. Robinson • BAL 5.4

WAR for Pitchers

<strong>Wins Above Replacement for Pitchers</strong><br>A single number that presents the number of wins the player added<br>to the team above what a replacement player (think AAA or AAAA) would add. This value includes defensive support and includes additional value for high leverage situations.<br>Scale: 8+ MVP Quality, 5+ All-Star Quality, 2+ Starter,<br>0-2 Reserve, < 0 Replacement Level <br> Developed by Sean Smith of BaseballProjection.com

1. Merritt • MIN 6.5
2. Chance • MIN 5.9
3. Horlen • CHW 5.5
4. Hunter • KCA 4.6
5. Siebert • CLE 4.6
6. Boswell • MIN 4.6
7. Tiant • CLE 4.6
8. Hargan • CLE 4.5
9. Downing • NYY 4.5
10. Kaat • MIN 4.2

Earned Run Average

<strong>9 * ER / IP</strong><br>For recent years, leaders need 1 IP<br>per team game played.<br>Bold indicates lowest ERA using current stats<br><span class=glimmer>Gold</span> means awarded ERA title at end of year.

1. Horlen • CHW 2.06
2. Peters • CHW 2.28
3. Siebert • CLE 2.38
4. John • CHW 2.47
5. Merritt • MIN 2.53
6. Clark • CAL 2.59
7. Hargan • CLE 2.62
8. Downing • NYY 2.63
9. Chance • MIN 2.73
10. Tiant • CLE 2.74

Wins

Wins

1. Lonborg • BOS 22
Wilson • DET 22
3. Chance • MIN 20
4. Horlen • CHW 19
5. McLain • DET 17
6. Kaat • MIN 16
Peters • CHW 16
Sparma • DET 16
9. Stottlemyre • NYY 15
10. Boswell • MIN 14
Downing • NYY 14
Hargan • CLE 14
Lolich • DET 14
Phoebus • BAL 14

Win-Loss %

<strong>Win-Loss Percentage</strong><br>W / (W + L)<br>For players, leaders need one decision for every ten team games.<br>For managers, minimum to qualify for leading is 320 games.

1. Santiago • BOS .750
2. Horlen • CHW .731
3. Lonborg • BOS .710
4. Wilson • DET .667
5. Merritt • MIN .650
6. Sparma • DET .640
7. Phoebus • BAL .609
8. McGlothlin • CAL .600
9. Peters • CHW .593
10. Wyatt • BOS .588
Chance • MIN .588

Walks & Hits per IP

<strong>(BB + H)/IP</strong><br>For recent years, leaders need 1 IP<br>per team game played

1. Horlen • CHW 0.953
2. Merritt • MIN 0.993
3. Siebert • CLE 1.025
4. John • CHW 1.065
5. Peters • CHW 1.069
6. Lolich • DET 1.083
7. Downing • NYY 1.086
8. Chance • MIN 1.100
9. McGlothlin • CAL 1.110
10. Stange • BOS 1.117

Hits per 9 IP

<strong>9 x H / IP</strong><br>For recent years, leaders need 1 IP<br>per team game played

1. Peters • CHW 6.473
2. Boswell • MIN 6.548
3. Horlen • CHW 6.558
4. Siebert • CLE 6.604
5. Downing • NYY 7.051
6. John • CHW 7.217
7. Hunter • KCA 7.244
8. Hargan • CLE 7.265
9. Lolich • DET 7.279
10. Brunet • CAL 7.308

Bases On Balls per 9 IP

<strong>9 x BB / IP</strong><br>For recent years, leaders need 1 IP<br>per team game played

1. Merritt • MIN 1.186
2. Kaat • MIN 1.435
3. Stange • BOS 1.585
4. Horlen • CHW 2.023
5. Peterson • NYY 2.134
6. Chance • MIN 2.157
7. Ortega • WSA 2.335
8. Pascual • WSA 2.350
9. John • CHW 2.372
10. Lolich • DET 2.471

Strikeouts per 9 IP

<strong>9 x SO / IP</strong><br>For recent years, leaders need 1 IP<br>per team game played

1. Tiant • CLE 9.225
2. McDowell • CLE 8.987
3. Boswell • MIN 8.246
4. Lonborg • BOS 8.100
5. Phoebus • BAL 7.745
6. Lolich • DET 7.676
7. Downing • NYY 7.631
8. Nash • KCA 7.529
9. Peters • CHW 7.442
10. Kaat • MIN 7.211

Games Played

Games Played or Pitched

1. Locker • CHW 77
2. Rojas • CAL 72
3. Kelso • CAL 69
4. Womack • NYY 65
5. McMahon • 2TM 63
6. Knowles • WSA 61
7. Wyatt • BOS 60
8. Worthington • MIN 59
9. Baldwin • WSA 58
10. Aker • KCA 57

Saves

Saves

1. Rojas • CAL 27
2. Locker • CHW 20
Wyatt • BOS 20
4. Womack • NYY 18
5. Worthington • MIN 16
6. Knowles • WSA 14
7. Aker • KCA 12
Gladding • DET 12
Drabowsky • BAL 12
Wilhelm • CHW 12
Baldwin • WSA 12

Innings Pitched

Innings Pitched

1. Chance • MIN 283.2
2. Lonborg • BOS 273.1
3. Wilson • DET 264.0
4. Kaat • MIN 263.1
5. Peters • CHW 260.0
6. Hunter • KCA 259.2
7. Horlen • CHW 258.0
8. Stottlemyre • NYY 255.0
9. Brunet • CAL 250.0
10. McDowell • CLE 236.1

Strikeouts

Strikeouts

1. Lonborg • BOS 246
2. McDowell • CLE 236
3. Chance • MIN 220
4. Tiant • CLE 219
5. Peters • CHW 215
6. Kaat • MIN 211
7. Boswell • MIN 204
8. Hunter • KCA 196
9. Nash • KCA 186
10. Wilson • DET 184

Games Started

Games Started

1. Chance • MIN 39
Lonborg • BOS 39
3. Kaat • MIN 38
Wilson • DET 38
5. Brunet • CAL 37
McDowell • CLE 37
McLain • DET 37
Sparma • DET 37
9. Peters • CHW 36
Stottlemyre • NYY 36

Complete Games

Complete Game

1. Chance • MIN 18
2. Lonborg • BOS 15
Hargan • CLE 15
4. Kaat • MIN 13
Hunter • KCA 13
Horlen • CHW 13
7. Wilson • DET 12
8. Lolich • DET 11
Boswell • MIN 11
Sparma • DET 11
Peters • CHW 11
Merritt • MIN 11

Shutouts

Shutouts<br>No runs allowed and a complete game.

1. McGlothlin • CAL 6
Lolich • DET 6
John • CHW 6
Horlen • CHW 6
Hargan • CLE 6
6. Hunter • KCA 5
Chance • MIN 5
Sparma • DET 5
9. Bertaina • 2TM 4
Merritt • MIN 4
Downing • NYY 4
Phoebus • BAL 4
Stottlemyre • NYY 4

Home Runs

Home Runs Hit/Allowed

1. McLain • DET 35
2. Wilson • DET 34
3. Tiant • CLE 24
4. Lonborg • BOS 23
Bell • 2TM 23
6. Brandon • BOS 21
Kaat • MIN 21
McDowell • CLE 21
Merritt • MIN 21
Nash • KCA 21

Bases on Balls

Bases on Balls/Walks

1. McDowell • CLE 123
2. Barber • 2TM 115
3. Phoebus • BAL 114
4. Boswell • MIN 107
5. Wilson • DET 92
6. Peters • CHW 91
7. Brunet • CAL 90
8. Stottlemyre • NYY 88
9. Nash • KCA 87
10. Sparma • DET 85

Hits

Hits/Hits Allowed

1. Kaat • MIN 269
2. Chance • MIN 244
3. Stottlemyre • NYY 235
4. Lonborg • BOS 228
5. Wilson • DET 216
6. Hunter • KCA 209
McLain • DET 209
8. Brunet • CAL 203
9. McDowell • CLE 201
10. Nash • KCA 200

Strikeouts / Base On Balls

<strong>SO/W or SO/BB</strong><br>For recent years, pitching leaders need 1 IP<br>per team game played.<br>No batting leaders computed.

1. Merritt • MIN 5.367
2. Kaat • MIN 5.024
3. Tiant • CLE 3.269
4. Chance • MIN 3.235
5. Stange • BOS 3.156
6. Lolich • DET 3.107
7. Lonborg • BOS 2.964
8. Downing • NYY 2.803
9. Siebert • CLE 2.519
10. Pascual • WSA 2.465

Home Runs per 9 IP

<strong>9 x HR / IP</strong><br>For recent years, leaders need 1 IP<br>per team game played

1. Hargan • CLE 0.363
2. Horlen • CHW 0.453
3. Barber • 2TM 0.470
4. Peters • CHW 0.519
5. Chance • MIN 0.539
6. Peterson • NYY 0.546
7. Hunter • KCA 0.555
8. Boswell • MIN 0.566
9. Downing • NYY 0.580
10. McGlothlin • CAL 0.593

Losses

Losses

1. Brunet • CAL 19
2. Barber • 2TM 18
3. Hunter • KCA 17
Krausse • KCA 17
Nash • KCA 17
6. McLain • DET 16
Richert • 2TM 16
8. McDowell • CLE 15
Stottlemyre • NYY 15
10. Chance • MIN 14
Peterson • NYY 14

Earned Runs

Earned Runs Allowed

1. McDowell • CLE 101
2. McLain • DET 99
3. Lonborg • BOS 96
Wilson • DET 96
5. Nash • KCA 93
6. Brunet • CAL 92
7. Sparma • DET 91
8. Kaat • MIN 89
9. Chance • MIN 86
10. Stottlemyre • NYY 84

Wild Pitches

Wild Pitches

1. McDowell • CLE 18
2. Barber • 2TM 14
3. McGlothlin • CAL 13
4. Clark • CAL 12
Lonborg • BOS 12
Phoebus • BAL 12
7. Hamilton • CAL 11
8. Dobson • KCA 10
Merritt • MIN 10
10. Brandon • BOS 9
Chance • MIN 9
Hargan • CLE 9
Kaat • MIN 9

Hit By Pitch

Times Hit by a Pitch.

1. Lonborg • BOS 19
2. Peters • CHW 11
3. Locker • CHW 10
4. Coleman • WSA 9
Kaat • MIN 9
6. Sparma • DET 8
Barber • 2TM 8
8. Boswell • MIN 7
Brandon • BOS 7
Chance • MIN 7
Lolich • DET 7
McDowell • CLE 7
Merritt • MIN 7

Batters Faced

Batters Faced

1. Chance • MIN 1,161
2. Lonborg • BOS 1,130
3. Kaat • MIN 1,100
4. Wilson • DET 1,083
5. Stottlemyre • NYY 1,063
6. Peters • CHW 1,060
7. Hunter • KCA 1,053
8. Brunet • CAL 1,027
9. McDowell • CLE 1,014
10. Horlen • CHW 995

Games Finished

Games Finished<br>Credited to the last pitcher to appear for a team in a game.<br>Complete Games are not counted as Games Finished.

1. Rojas • CAL 53
2. Womack • NYY 48
3. Locker • CHW 47
4. Worthington • MIN 44
5. Wyatt • BOS 43
6. Aker • KCA 40
7. Knowles • WSA 35
8. Kelso • CAL 32
9. Miller • BAL 31
10. Wilhelm • CHW 30

Adjusted ERA+

<strong>ERA+</strong><br>100*[lgERA/ERA]<br>Adjusted to the player&#x2019;s ballpark(s).

1. Horlen • CHW 146
2. Siebert • CLE 139
3. Merritt • MIN 138
4. Peters • CHW 132
5. Chance • MIN 128
6. Stange • BOS 127
7. Hargan • CLE 126
8. John • CHW 122
9. Tiant • CLE 121
10. Clark • CAL 120

Fielding Independent Pitching

<strong>Fielding Independent Pitching</strong><br>this stat measures a pitcher's effectiveness at preventing HR, BB, HBP and causing SO<br><tt>(13*HR + 3*(BB+HBP) - 2*SO)/IP + Constant<sub>lg</sub></tt><br>The constant is set so that each season major-league average FIP is the same as the major-league avg ERA

1. Kaat • MIN 2.55
2. Chance • MIN 2.56
3. Lolich • DET 2.65
4. Downing • NYY 2.68
5. Hargan • CLE 2.81
6. Merritt • MIN 2.81
7. Peters • CHW 2.81
8. Hunter • KCA 2.82
9. Tiant • CLE 2.90
10. McGlothlin • CAL 2.92

Adj. Pitching Runs

<strong>Adjusted Pitching Runs</strong><br>A set of formulas developed by Gary Gillette, Pete Palmer and others<br>that estimates a pitcher&#x2019;s total contributions<br>to a team&#x2019;s runs total via linear weights.<br>0.0 is an avg performance, <0 is worse than avg and >0 is better than avg

1. Horlen • CHW 30
2. Merritt • MIN 23
3. Peters • CHW 20
4. Chance • MIN 18
5. Siebert • CLE 17
6. Drabowsky • BAL 16
7. Wilhelm • CHW 15
8. Hargan • CLE 14
9. McMahon • 2TM 14
10. Stange • BOS 14

Adj. Pitching Wins

<strong>Adjusted Pitching Wins</strong><br>A set of formulas developed by Gary Gillette, Pete Palmer and others<br>that estimates a pitcher&#x2019;s total contributions<br>to a team&#x2019;s wins with his arm.<br>0.0 is an avg performance, <0 is worse than avg and >0 is better than avg

1. Horlen • CHW 3.5
2. Merritt • MIN 2.7
3. Peters • CHW 2.3
4. Chance • MIN 2.1
5. Siebert • CLE 2.0
6. Drabowsky • BAL 1.9
7. Wilhelm • CHW 1.7
8. Hargan • CLE 1.7
9. McMahon • 2TM 1.6
Stange • BOS 1.6

Base-Out Runs Saved (RE24)

<strong>Base-Out Runs Saved</strong><br>Given the bases occupied/out situation, how many runs did the pitcher<br>save in the resulting play. Compared to average, so 0 is average, and<br>above 0 is better than average

1. Horlen • CHW 38.66
2. Peters • CHW 23.35
3. McMahon • 2TM 20.72
4. Chance • MIN 18.09
5. Downing • NYY 17.87
6. Merritt • MIN 17.82
7. Lolich • DET 17.55
8. Lonborg • BOS 16.55
9. Hardin • BAL 16.46
10. Siebert • CLE 15.62

Win Probability Added (WPA)

<strong>Win Probability Added by Pitcher</strong><br>Given average teams, this is the change in probability.<br>See <a href='https://www.baseball-reference.com/about/wpa.shtml'>Win Expectancy explainer</a> for details.

1. Horlen • CHW 4.6
2. Wilhelm • CHW 3.8
3. Downing • NYY 2.9
4. Chance • MIN 2.7
5. Hargan • CLE 2.7
6. Knowles • WSA 2.6
7. McMahon • 2TM 2.6
8. Wyatt • BOS 2.5
9. Peters • CHW 2.3
10. Locker • CHW 2.2

Sit. Wins Saved (WPA/LI)

<strong>Situational Wins (WPA/LI)</strong><br>It is the sum of WPA divided by the leverage index for each play.<br>WPA depends greatly on the context of the at bats.<br>This stat does not.

1. Horlen • CHW 4.7
2. Peters • CHW 2.7
3. Merritt • MIN 2.5
4. Watt • BAL 2.3
5. Chance • MIN 2.2
6. Lolich • DET 2.2
7. Downing • NYY 2.2
8. Siebert • CLE 2.1
9. Hargan • CLE 2.0
10. Hunter • KCA 2.0

Championship WPA (cWPA)

<strong>Championship Win Probability Added by Pitcher</strong><br>Given average teams, this is the change in probability of winning the World Series, displayed in percentage points.<br>See <a href='https://www.baseball-reference.com/about/wpa.shtml'>Win Expectancy explainer</a> for details.

1. Horlen • CHW 13.4
2. Wilhelm • CHW 12.1
3. McMahon • 2TM 11.1
4. Lonborg • BOS 9.1
5. Lolich • DET 9.0
6. Kaat • MIN 8.9
7. Peters • CHW 8.0
8. John • CHW 5.1
9. Locker • CHW 4.6
10. Carlos • CHW 4.4

Base-Out Wins Saved (REW)

<strong>Base-Out Wins Saved</strong><br>This is the number of wins above average the player was worth by their performance<br>measured by the 24 base-out situations.

1. Horlen • CHW 4.8
2. Peters • CHW 2.8
3. McMahon • 2TM 2.5
4. Downing • NYY 2.1
5. Lolich • DET 2.0
6. Chance • MIN 2.0
7. Hardin • BAL 2.0
8. Merritt • MIN 2.0
9. Lonborg • BOS 1.8
10. Siebert • CLE 1.8

A ** by the stat's value indicates the player had fewer than the required number of at bats or plate appearances for the BA, OBP, SLG or OPS title that year. In order to rank the player, the necessary number of hitless at bats were added to the player's season total. The value printed here is their actual value and not the value used to rank them, therefore some numbers may appear out of order.

For rate stats, generally a minimum of 3.1 Plate Appearances/Team Game (batting), 1.0 IP/Team Game (pitching), 0.67 Gm and Chances/Team Game (fielding), 0.2 SB att/Team Game (catchers), 0.1 SB att/Team Game (baserunners only since 1951), and 0.1 decision/Team Game (W-L%) is needed for single-season leaderboards. For pitcher fielding the minimums are reduced by a third. For LF, CF, RF fielding stats, we only have reliable data since 1898, so all leaders are since 1898. Explanation of min. requirements