| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 13.47 | 193109041_OAK_BOS |
| Bill Walker | SFN | 6.84 | 193109040_LAN_SFN |
| Ed Brandt | ATL | 6.07 | 193109040_ATL_PHI |
| Bill Hallahan | SLN | 2.09 | 193109040_SLN_PIT |
| Ray Kremer | PIT | 1.99 | 193109050_SLN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Pat Caraway | CHA | -7.94 | 193109050_DET_CHA |
| Stew Bolen | PHI | -2.34 | 193109062_PHI_LAN |
| Jack Russell | BOS | -2.08 | 193109042_OAK_BOS |
| Hank Johnson | NYA | -1.67 | 193109040_NYA_MIN |
| Tommy Bridges | DET | -1.67 | 193109050_DET_CHA |
Based on accumulated WAA for this season up to 1931-09-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 12.3 | Lefty Grove | 249.7 | OAK |
| +006+ | 9.45 | Bill Walker | 216 | SFN |
| +009+ | 7.8 | Carl Hubbell | 220.7 | SFN |
| +012+ | 7.27 | Ed Brandt | 222.7 | ATL |
| +013+ | 7.05 | Freddie Fitzsimmons | 234.7 | SFN |
| +017+ | 5.46 | Ray Kremer | 225.3 | PIT |
| +018+ | 5.3 | Lefty Gomez | 204.3 | NYA |
| +019+ | 5.29 | Bill Hallahan | 207.3 | SLN |
| +022+ | 4.97 | Tom Zachary | 194.3 | ATL |
| +024+ | 4.78 | Ray Benge | 219.3 | PHI |
| +026+ | 4.64 | George Earnshaw | 253 | OAK |
| +028+ | 4.49 | Heinie Meine | 235 | PIT |
| +029+ | 4.44 | Larry French | 241 | PIT |
| +030+ | 4.22 | Si Johnson | 245.7 | CIN |
| +034+ | 3.96 | Watty Clark | 190.7 | LAN |
| +036+ | 3.82 | Lloyd Brown | 222 | MIN |
| +039+ | 3.65 | Jim Mooney | 46.7 | SFN |
| +040+ | 3.49 | Syl Johnson | 164.7 | SLN |
| +041+ | 3.47 | Charlie Root | 225.7 | CHN |
| +042+ | 3.45 | Glenn Spencer | 160.7 | PIT |
| +043+ | 3.38 | Flint Rhem | 185.3 | SLN |
| +046+ | 3.19 | Jesse Haines | 122.3 | SLN |
| +048+ | 3.08 | Bob Smith | 206.3 | CHN |
| +049+ | 3.05 | Dazzy Vance | 198.7 | LAN |
| +051+ | 2.97 | Firpo Marberry | 182.3 | MIN |
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