| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Hubbell | SFN | 4.66 | 193109021_SFN_ATL |
| Lloyd Brown | MIN | 2.4 | 193108310_MIN_NYA |
| Tom Zachary | ATL | 2.05 | 193109022_SFN_ATL |
| Lefty Gomez | NYA | 1.52 | 193109011_BOS_NYA |
| Charlie Root | CHN | 1.13 | 193109021_CHN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Pat Caraway | CHA | -6.76 | 193108310_CLE_CHA |
| Rollie Stiles | BAL | -3.31 | 193108310_DET_BAL |
| Waite Hoyt | OAK | -1.88 | 193108310_BOS_OAK |
| Red Ruffing | NYA | -1.71 | 193109012_BOS_NYA |
| Chief Hogsett | DET | -1.42 | 193109022_DET_BAL |
Based on accumulated WAA for this season up to 1931-09-02.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 11.48 | Lefty Grove | 240.7 | OAK |
| +007+ | 8.64 | Bill Walker | 207 | SFN |
| +008+ | 8.57 | Ed Brandt | 218.7 | ATL |
| +010+ | 7.67 | Carl Hubbell | 218.7 | SFN |
| +013+ | 6.65 | Freddie Fitzsimmons | 227.7 | SFN |
| +017+ | 5.19 | Larry French | 239.3 | PIT |
| +019+ | 5.1 | Bill Hallahan | 198.7 | SLN |
| +020+ | 5.07 | Ray Kremer | 216.3 | PIT |
| +022+ | 4.97 | Tom Zachary | 194.3 | ATL |
| +024+ | 4.8 | Ray Benge | 210.3 | PHI |
| +025+ | 4.57 | Lloyd Brown | 213.7 | MIN |
| +026+ | 4.49 | Lefty Gomez | 195.3 | NYA |
| +028+ | 4.37 | Dazzy Vance | 192.7 | LAN |
| +032+ | 3.99 | Si Johnson | 237.7 | CIN |
| +033+ | 3.94 | Bob Smith | 203.7 | CHN |
| +035+ | 3.9 | Heinie Meine | 226 | PIT |
| +036+ | 3.83 | George Earnshaw | 244 | OAK |
| +037+ | 3.82 | Watty Clark | 182.7 | LAN |
| +038+ | 3.82 | Charlie Root | 217.7 | CHN |
| +042+ | 3.52 | Firpo Marberry | 178.7 | MIN |
| +044+ | 3.45 | Jesse Haines | 116.3 | SLN |
| +046+ | 3.26 | Glenn Spencer | 151.7 | PIT |
| +051+ | 2.8 | Fred Heimach | 111.3 | LAN |
| +052+ | 2.8 | Jim Mooney | 37.7 | SFN |
| +054+ | 2.63 | Syl Johnson | 155.7 | SLN |
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