| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 14.99 | 193109180_CHA_OAK |
| Carl Hubbell | SFN | 6.17 | 193109201_SFN_CHN |
| Larry French | PIT | 2.84 | 193109181_ATL_PIT |
| Ed Brandt | ATL | 2.8 | 193109181_ATL_PIT |
| Lloyd Brown | MIN | 1.82 | 193109190_DET_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Russell | BOS | -4.35 | 193109181_CLE_BOS |
| Waite Hoyt | OAK | -2.29 | 193109192_CHA_OAK |
| Hank Johnson | NYA | -1.72 | 193109201_CLE_NYA |
| Tommy Thomas | CHA | -1.48 | 193109192_CHA_OAK |
| Clint Brown | CLE | -1.22 | 193109182_CLE_BOS |
Based on accumulated WAA for this season up to 1931-09-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 13.93 | Lefty Grove | 276.7 | OAK |
| +006+ | 10.28 | Bill Walker | 239.3 | SFN |
| +009+ | 8.28 | Carl Hubbell | 247 | SFN |
| +011+ | 7.82 | Freddie Fitzsimmons | 251 | SFN |
| +015+ | 6.8 | Ed Brandt | 249.7 | ATL |
| +017+ | 6.51 | Lefty Gomez | 226.3 | NYA |
| +018+ | 6.19 | Heinie Meine | 262 | PIT |
| +019+ | 6.15 | Bill Hallahan | 234.3 | SLN |
| +023+ | 5.6 | Larry French | 269 | PIT |
| +024+ | 5.41 | Tom Zachary | 219.7 | ATL |
| +026+ | 5.16 | Lloyd Brown | 248.7 | MIN |
| +027+ | 4.96 | Bob Smith | 233.3 | CHN |
| +028+ | 4.87 | Ray Benge | 236.3 | PHI |
| +030+ | 4.72 | Watty Clark | 224.3 | LAN |
| +031+ | 4.44 | Syl Johnson | 176.7 | SLN |
| +039+ | 4.09 | Ray Kremer | 231 | PIT |
| +040+ | 4.04 | George Earnshaw | 272 | OAK |
| +041+ | 3.95 | Larry Benton | 194.7 | CIN |
| +043+ | 3.77 | Bump Hadley | 169.3 | MIN |
| +044+ | 3.77 | Firpo Marberry | 211.7 | MIN |
| +045+ | 3.76 | Dazzy Vance | 218.7 | LAN |
| +048+ | 3.58 | Glenn Spencer | 177 | PIT |
| +049+ | 3.49 | Jim Mooney | 71.7 | SFN |
| +053+ | 3.19 | Charlie Root | 245.7 | CHN |
| +056+ | 3.04 | Red Lucas | 219.7 | CIN |
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