| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 13.54 | 193109121_BAL_OAK |
| Carl Hubbell | SFN | 5.49 | 193109100_SFN_PIT |
| Ray Kremer | PIT | 2.11 | 193109100_SFN_PIT |
| Bill Hallahan | SLN | 2.09 | 193109100_ATL_SLN |
| Tom Zachary | ATL | 2.07 | 193109120_ATL_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Waite Hoyt | OAK | -1.52 | 193109122_BAL_OAK |
| Hank Johnson | NYA | -1.51 | 193109110_CHA_NYA |
| Sam Gray | BAL | -1.34 | 193109121_BAL_OAK |
| Tommy Bridges | DET | -1.24 | 193109100_DET_BOS |
| Ed Durham | BOS | -1.07 | 193109120_DET_BOS |
Based on accumulated WAA for this season up to 1931-09-12.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 13.42 | Lefty Grove | 267.7 | OAK |
| +007+ | 9.28 | Bill Walker | 222 | SFN |
| +008+ | 9.2 | Carl Hubbell | 238.7 | SFN |
| +012+ | 7.05 | Ed Brandt | 232.3 | ATL |
| +013+ | 6.92 | Freddie Fitzsimmons | 234.7 | SFN |
| +017+ | 5.79 | Larry French | 259 | PIT |
| +019+ | 5.6 | Bill Hallahan | 216.3 | SLN |
| +021+ | 5.28 | Tom Zachary | 209.3 | ATL |
| +022+ | 5.2 | Heinie Meine | 244 | PIT |
| +024+ | 5.06 | Lefty Gomez | 205.3 | NYA |
| +026+ | 4.72 | Ray Benge | 219.3 | PHI |
| +027+ | 4.68 | George Earnshaw | 262 | OAK |
| +030+ | 4.5 | Ray Kremer | 225.7 | PIT |
| +032+ | 4.45 | Bob Smith | 224.3 | CHN |
| +033+ | 4.29 | Lloyd Brown | 230.7 | MIN |
| +034+ | 4.24 | Syl Johnson | 173.7 | SLN |
| +035+ | 4.21 | Watty Clark | 209.7 | LAN |
| +041+ | 3.62 | Si Johnson | 251.7 | CIN |
| +042+ | 3.62 | Dazzy Vance | 205.7 | LAN |
| +045+ | 3.57 | Firpo Marberry | 194.3 | MIN |
| +047+ | 3.48 | Jim Mooney | 62.7 | SFN |
| +048+ | 3.44 | Glenn Spencer | 161.7 | PIT |
| +049+ | 3.32 | Charlie Root | 225.7 | CHN |
| +050+ | 3.1 | Jesse Haines | 122.3 | SLN |
| +052+ | 3 | Bump Hadley | 159.7 | MIN |
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