| Starter | Tm | Tier | Game |
|---|---|---|---|
| Les Sweetland | CHN | -1.46 | 193106120_PHI_CHN |
| Dick Coffman | BAL | -1.06 | 193106120_BAL_OAK |
| Milt Shoffner | CLE | -1.01 | 193106130_CLE_MIN |
| Larry Benton | CIN | -0.94 | 193106130_LAN_CIN |
| Hank Johnson | NYA | -0.84 | 193106120_CHA_NYA |
Based on accumulated WAA for this season up to 1931-06-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.1 | Lefty Grove | 108.3 | OAK |
| +010+ | 3.53 | Lloyd Brown | 104.7 | MIN |
| +011+ | 3.38 | Tom Zachary | 73.3 | ATL |
| +012+ | 3.03 | Clarence Mitchell | 90 | SFN |
| +015+ | 2.96 | George Uhle | 67.3 | DET |
| +018+ | 2.88 | George Earnshaw | 112 | OAK |
| +019+ | 2.8 | Freddie Fitzsimmons | 92 | SFN |
| +021+ | 2.59 | Charlie Root | 77.3 | CHN |
| +022+ | 2.55 | Bill Hallahan | 81 | SLN |
| +023+ | 2.55 | Bob Smith | 79 | CHN |
| +025+ | 2.5 | Si Johnson | 95.7 | CIN |
| +026+ | 2.49 | Ed Morris | 51 | BOS |
| +027+ | 2.34 | Sam Jones | 83 | MIN |
| +030+ | 2.05 | Jack Berly | 56 | SFN |
| +031+ | 2.05 | Ed Brandt | 92 | ATL |
| +035+ | 1.84 | Pat Caraway | 107.3 | CHA |
| +036+ | 1.77 | Heinie Meine | 100 | PIT |
| +038+ | 1.71 | Ray Benge | 78.3 | PHI |
| +039+ | 1.68 | Lefty Gomez | 57.3 | NYA |
| +040+ | 1.66 | Socks Seibold | 83.7 | ATL |
| +045+ | 1.54 | Rube Walberg | 104.7 | OAK |
| +048+ | 1.38 | Syl Johnson | 58 | SLN |
| +050+ | 1.37 | Dazzy Vance | 72.3 | LAN |
| +051+ | 1.36 | Carl Fischer | 79.3 | MIN |
| +052+ | 1.36 | Red Lucas | 92.7 | CIN |
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