| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Hubbell | SFN | 5.21 | 193109071_PHI_SFN |
| Ed Brandt | ATL | 4.25 | 193109071_ATL_LAN |
| Ray Kremer | PIT | 1.99 | 193109050_SLN_PIT |
| Lloyd Brown | MIN | 1.91 | 193109052_NYA_MIN |
| Ray Benge | PHI | 1.88 | 193109051_ATL_PHI |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Pat Caraway | CHA | -7.94 | 193109050_DET_CHA |
| Jack Russell | BOS | -2.71 | 193109072_MIN_BOS |
| Stew Bolen | PHI | -2.34 | 193109062_PHI_LAN |
| Tommy Bridges | DET | -1.67 | 193109050_DET_CHA |
| Red Ruffing | NYA | -1.27 | 193109052_NYA_MIN |
Based on accumulated WAA for this season up to 1931-09-07.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 12.25 | Lefty Grove | 249.7 | OAK |
| +006+ | 9.41 | Bill Walker | 216 | SFN |
| +009+ | 8.62 | Carl Hubbell | 229.7 | SFN |
| +012+ | 7.11 | Ed Brandt | 232.3 | ATL |
| +013+ | 7 | Freddie Fitzsimmons | 234.7 | SFN |
| +017+ | 5.5 | Tom Zachary | 202.3 | ATL |
| +018+ | 5.41 | Ray Kremer | 225.3 | PIT |
| +020+ | 5.27 | Lefty Gomez | 204.3 | NYA |
| +021+ | 5.26 | Larry French | 250 | PIT |
| +022+ | 5.25 | Bill Hallahan | 207.3 | SLN |
| +025+ | 4.77 | Ray Benge | 219.3 | PHI |
| +027+ | 4.6 | George Earnshaw | 253 | OAK |
| +029+ | 4.45 | Heinie Meine | 235 | PIT |
| +032+ | 4.2 | Si Johnson | 245.7 | CIN |
| +034+ | 4.03 | Watty Clark | 200.7 | LAN |
| +036+ | 3.9 | Bob Smith | 215.3 | CHN |
| +038+ | 3.78 | Lloyd Brown | 222 | MIN |
| +040+ | 3.64 | Jim Mooney | 46.7 | SFN |
| +042+ | 3.58 | Firpo Marberry | 191.3 | MIN |
| +044+ | 3.46 | Syl Johnson | 164.7 | SLN |
| +045+ | 3.43 | Charlie Root | 225.7 | CHN |
| +046+ | 3.42 | Glenn Spencer | 160.7 | PIT |
| +047+ | 3.35 | Flint Rhem | 185.3 | SLN |
| +050+ | 3.16 | Jesse Haines | 122.3 | SLN |
| +051+ | 3 | Dazzy Vance | 198.7 | LAN |
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