| Starter | Tm | Tier | Game |
|---|---|---|---|
| Milt Shoffner | CLE | -1.57 | 193106201_MIN_CLE |
| Les Sweetland | CHN | -1.11 | 193106181_CHN_LAN |
| Phil Collins | PHI | -1.02 | 193106190_CIN_PHI |
| Ray Kolp | CIN | -0.66 | 193106190_CIN_PHI |
| Hank Johnson | NYA | -0.45 | 193106190_NYA_BAL |
Based on accumulated WAA for this season up to 1931-06-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.11 | Lefty Grove | 117.3 | OAK |
| +007+ | 4.32 | Freddie Fitzsimmons | 110 | SFN |
| +010+ | 3.87 | Tom Zachary | 82.7 | ATL |
| +011+ | 3.79 | Lloyd Brown | 120.3 | MIN |
| +014+ | 3.35 | Si Johnson | 112.7 | CIN |
| +015+ | 3.31 | George Earnshaw | 121 | OAK |
| +017+ | 3.02 | Bill Hallahan | 90 | SLN |
| +018+ | 2.95 | Clarence Mitchell | 98 | SFN |
| +020+ | 2.9 | Charlie Root | 93.3 | CHN |
| +022+ | 2.86 | George Uhle | 77.3 | DET |
| +023+ | 2.73 | Rube Walberg | 123.7 | OAK |
| +029+ | 2.36 | Ed Morris | 56.3 | BOS |
| +030+ | 2.31 | Ed Brandt | 99 | ATL |
| +032+ | 2.19 | Heinie Meine | 108 | PIT |
| +035+ | 2.05 | Jack Berly | 56 | SFN |
| +036+ | 2.02 | Ray Benge | 92 | PHI |
| +038+ | 1.99 | Lefty Gomez | 67.3 | NYA |
| +039+ | 1.92 | Ray Kremer | 96.7 | PIT |
| +041+ | 1.77 | Bill Walker | 72.7 | SFN |
| +042+ | 1.71 | Watty Clark | 76 | LAN |
| +044+ | 1.65 | Red Lucas | 99.7 | CIN |
| +046+ | 1.59 | Jim Lindsey | 31.7 | SLN |
| +048+ | 1.56 | Clise Dudley | 78.7 | PHI |
| +049+ | 1.54 | Carl Hubbell | 79 | SFN |
| +050+ | 1.52 | Burleigh Grimes | 89.7 | SLN |
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