| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Hubbell | SFN | 6.17 | 193109201_SFN_CHN |
| Bill Hallahan | SLN | 2.76 | 193109210_LAN_SLN |
| Lloyd Brown | MIN | 1.82 | 193109190_DET_MIN |
| Bob Smith | CHN | 1.48 | 193109210_SFN_CHN |
| Watty Clark | LAN | 1.02 | 193109200_LAN_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Chief Hogsett | DET | -2.52 | 193109211_DET_OAK |
| Waite Hoyt | OAK | -2.29 | 193109192_CHA_OAK |
| Hank Johnson | NYA | -1.72 | 193109201_CLE_NYA |
| Tommy Thomas | CHA | -1.48 | 193109192_CHA_OAK |
| Sam Gray | BAL | -1.27 | 193109212_BAL_BOS |
Based on accumulated WAA for this season up to 1931-09-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 13.95 | Lefty Grove | 276.7 | OAK |
| +006+ | 10.3 | Bill Walker | 239.3 | SFN |
| +009+ | 8.3 | Carl Hubbell | 247 | SFN |
| +011+ | 7.84 | Freddie Fitzsimmons | 251 | SFN |
| +016+ | 6.84 | Ed Brandt | 249.7 | ATL |
| +017+ | 6.53 | Lefty Gomez | 226.3 | NYA |
| +018+ | 6.21 | Heinie Meine | 262 | PIT |
| +022+ | 5.62 | Larry French | 269 | PIT |
| +025+ | 5.18 | Lloyd Brown | 248.7 | MIN |
| +026+ | 5.05 | Ray Benge | 238 | PHI |
| +028+ | 4.73 | Watty Clark | 224.3 | LAN |
| +030+ | 4.56 | Bill Hallahan | 239.7 | SLN |
| +031+ | 4.44 | Syl Johnson | 176.7 | SLN |
| +033+ | 4.33 | Bob Smith | 235.3 | CHN |
| +038+ | 4.11 | Ray Kremer | 231 | PIT |
| +039+ | 4.06 | George Earnshaw | 272 | OAK |
| +042+ | 3.96 | Larry Benton | 194.7 | CIN |
| +043+ | 3.93 | Bump Hadley | 175.3 | MIN |
| +044+ | 3.86 | Firpo Marberry | 214.7 | MIN |
| +045+ | 3.76 | Dazzy Vance | 218.7 | LAN |
| +049+ | 3.52 | Red Lucas | 228.7 | CIN |
| +050+ | 3.5 | Jim Mooney | 71.7 | SFN |
| +051+ | 3.46 | Glenn Spencer | 180 | PIT |
| +054+ | 3.21 | Charlie Root | 245.7 | CHN |
| +063+ | 2.63 | Eddie Rommel | 118 | OAK |
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