| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Hubbell | SFN | 5.78 | 193107280_SFN_PIT |
| Charlie Root | CHN | 4.05 | 193107280_PHI_CHN |
| Tom Zachary | ATL | 3.21 | 193107280_ATL_SLN |
| Lloyd Brown | MIN | 2.5 | 193107260_BAL_MIN |
| Watty Clark | LAN | 2.35 | 193107280_LAN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Guy Bush | CHN | -2.47 | 193107270_PHI_CHN |
| Pat Caraway | CHA | -2.09 | 193107262_CHA_NYA |
| Tommy Bridges | DET | -1.9 | 193107270_DET_BOS |
| Jack Russell | BOS | -1.66 | 193107262_DET_BOS |
| Red Ruffing | NYA | -1.49 | 193107262_CHA_NYA |
Based on accumulated WAA for this season up to 1931-07-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 9.3 | Lefty Grove | 189 | OAK |
| +011+ | 4.87 | Carl Hubbell | 150.7 | SFN |
| +012+ | 4.7 | Tom Zachary | 133.3 | ATL |
| +013+ | 4.65 | Lloyd Brown | 171.3 | MIN |
| +014+ | 4.61 | Ed Brandt | 151.7 | ATL |
| +015+ | 4.61 | Charlie Root | 161.3 | CHN |
| +017+ | 4.56 | Freddie Fitzsimmons | 162.3 | SFN |
| +019+ | 4.22 | Bill Hallahan | 149.3 | SLN |
| +021+ | 4.09 | Ray Benge | 158.7 | PHI |
| +024+ | 3.83 | Ray Kremer | 167.3 | PIT |
| +025+ | 3.7 | Bill Walker | 130.3 | SFN |
| +026+ | 3.5 | Si Johnson | 170 | CIN |
| +029+ | 3.4 | Dazzy Vance | 141 | LAN |
| +030+ | 3.37 | Watty Clark | 140.7 | LAN |
| +031+ | 3.11 | Heinie Meine | 162 | PIT |
| +033+ | 2.97 | George Earnshaw | 208 | OAK |
| +034+ | 2.8 | Larry French | 178.3 | PIT |
| +035+ | 2.75 | Rube Walberg | 195 | OAK |
| +038+ | 2.58 | Lefty Gomez | 129 | NYA |
| +039+ | 2.55 | Bob Smith | 151 | CHN |
| +041+ | 2.5 | Firpo Marberry | 116.7 | MIN |
| +046+ | 2.27 | Jack Ogden | 68.3 | CIN |
| +047+ | 2.17 | Bump Hadley | 104.7 | MIN |
| +051+ | 2.11 | Sam Jones | 112.7 | MIN |
| +054+ | 2.04 | Syl Johnson | 118.7 | SLN |
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