| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Walker | SFN | 6.22 | 193109131_SFN_CIN |
| Ed Brandt | ATL | 3.58 | 193109131_ATL_CHN |
| Larry French | PIT | 2.5 | 193109152_LAN_PIT |
| Bill Hallahan | SLN | 2.28 | 193109132_PHI_SLN |
| Lefty Gomez | NYA | 2.05 | 193109131_DET_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Russell | BOS | -3.68 | 193109131_CHA_BOS |
| Stew Bolen | PHI | -2.3 | 193109131_PHI_SLN |
| Waite Hoyt | OAK | -2.01 | 193109142_CLE_OAK |
| Tommy Thomas | CHA | -1.28 | 193109140_CHA_BOS |
| Guy Bush | CHN | -1.25 | 193109132_ATL_CHN |
Based on accumulated WAA for this season up to 1931-09-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 13.4 | Lefty Grove | 267.7 | OAK |
| +005+ | 9.87 | Bill Walker | 230.3 | SFN |
| +008+ | 9.2 | Carl Hubbell | 238.7 | SFN |
| +011+ | 7.57 | Freddie Fitzsimmons | 243.7 | SFN |
| +017+ | 6.44 | Larry French | 268 | PIT |
| +018+ | 6.35 | Ed Brandt | 240.7 | ATL |
| +019+ | 6.02 | Bill Hallahan | 225.3 | SLN |
| +021+ | 5.92 | Lefty Gomez | 217.3 | NYA |
| +022+ | 5.64 | Heinie Meine | 253 | PIT |
| +024+ | 5.26 | Tom Zachary | 209.3 | ATL |
| +026+ | 4.93 | Lloyd Brown | 239.7 | MIN |
| +029+ | 4.5 | Ray Kremer | 225.7 | PIT |
| +031+ | 4.41 | Bob Smith | 224.3 | CHN |
| +033+ | 4.35 | George Earnshaw | 263 | OAK |
| +034+ | 4.23 | Syl Johnson | 173.7 | SLN |
| +035+ | 4.1 | Dazzy Vance | 212.7 | LAN |
| +037+ | 4.09 | Ray Benge | 227.3 | PHI |
| +040+ | 3.79 | Watty Clark | 211.7 | LAN |
| +043+ | 3.6 | Si Johnson | 251.7 | CIN |
| +044+ | 3.54 | Bump Hadley | 165.3 | MIN |
| +047+ | 3.48 | Jim Mooney | 62.7 | SFN |
| +048+ | 3.3 | Glenn Spencer | 169 | PIT |
| +050+ | 3.25 | Firpo Marberry | 197.7 | MIN |
| +052+ | 3.18 | Larry Benton | 185.7 | CIN |
| +053+ | 3.16 | Paul Derringer | 186.7 | SLN |
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