| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 14.99 | 193109180_CHA_OAK |
| Bill Walker | SFN | 6.83 | 193109170_SFN_SLN |
| Larry French | PIT | 2.84 | 193109181_ATL_PIT |
| Ed Brandt | ATL | 2.8 | 193109181_ATL_PIT |
| Lefty Gomez | NYA | 2.76 | 193109172_BAL_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Russell | BOS | -4.35 | 193109181_CLE_BOS |
| Clint Brown | CLE | -1.22 | 193109182_CLE_BOS |
| Ownie Carroll | CIN | -1.02 | 193109162_SFN_CIN |
| Red Ruffing | NYA | -0.9 | 193109171_BAL_NYA |
| Sam Gray | BAL | -0.73 | 193109172_BAL_NYA |
Based on accumulated WAA for this season up to 1931-09-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 13.98 | Lefty Grove | 276.7 | OAK |
| +005+ | 10.29 | Bill Walker | 239.3 | SFN |
| +008+ | 9.1 | Carl Hubbell | 246.7 | SFN |
| +011+ | 7.83 | Freddie Fitzsimmons | 251 | SFN |
| +015+ | 6.79 | Ed Brandt | 249.7 | ATL |
| +017+ | 6.51 | Lefty Gomez | 226.3 | NYA |
| +018+ | 6.24 | Heinie Meine | 262 | PIT |
| +020+ | 6.2 | Bill Hallahan | 234.3 | SLN |
| +021+ | 6.12 | Tom Zachary | 218.3 | ATL |
| +023+ | 5.65 | Larry French | 269 | PIT |
| +026+ | 5 | Bob Smith | 233.3 | CHN |
| +028+ | 4.82 | Lloyd Brown | 239.7 | MIN |
| +033+ | 4.19 | Syl Johnson | 173.7 | SLN |
| +034+ | 4.13 | Ray Kremer | 231 | PIT |
| +036+ | 4.09 | George Earnshaw | 272 | OAK |
| +035+ | 4.09 | Watty Clark | 215.3 | LAN |
| +039+ | 4.05 | Ray Benge | 227.3 | PHI |
| +038+ | 4.05 | Dazzy Vance | 212.7 | LAN |
| +042+ | 3.85 | Firpo Marberry | 211.7 | MIN |
| +045+ | 3.61 | Glenn Spencer | 177 | PIT |
| +047+ | 3.47 | Jim Mooney | 62.7 | SFN |
| +048+ | 3.46 | Bump Hadley | 165.3 | MIN |
| +050+ | 3.23 | Charlie Root | 245.7 | CHN |
| +052+ | 3.12 | Larry Benton | 185.7 | CIN |
| +053+ | 3.1 | Red Lucas | 219.7 | CIN |
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