| Starter | Tm | Tier | Game |
|---|---|---|---|
| Les Sweetland | CHN | -1.11 | 193106181_CHN_LAN |
| Ray Moss | ATL | -0.69 | 193106160_ATL_CHN |
| Ray Benge | PHI | -0.6 | 193106160_PHI_SLN |
| Dolf Luque | LAN | -0.02 | 193106182_CHN_LAN |
| Heinie Meine | PIT | -0.01 | 193106170_LAN_PIT |
Based on accumulated WAA for this season up to 1931-06-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.02 | Lefty Grove | 108.3 | OAK |
| +009+ | 3.67 | Lloyd Brown | 111.3 | MIN |
| +011+ | 3.38 | Freddie Fitzsimmons | 101 | SFN |
| +012+ | 3.25 | George Earnshaw | 121 | OAK |
| +013+ | 3.2 | Charlie Root | 86.3 | CHN |
| +016+ | 2.97 | George Uhle | 68.3 | DET |
| +017+ | 2.95 | Clarence Mitchell | 90 | SFN |
| +018+ | 2.94 | Tom Zachary | 73.7 | ATL |
| +023+ | 2.57 | Si Johnson | 103.7 | CIN |
| +024+ | 2.48 | Bill Hallahan | 81 | SLN |
| +026+ | 2.42 | Ed Morris | 51 | BOS |
| +027+ | 2.34 | Rube Walberg | 113.7 | OAK |
| +029+ | 2.28 | Sam Jones | 83 | MIN |
| +030+ | 2.24 | Ed Brandt | 99 | ATL |
| +033+ | 2.07 | Heinie Meine | 108 | PIT |
| +034+ | 2.07 | Ray Benge | 86.7 | PHI |
| +035+ | 2.01 | Jack Berly | 56 | SFN |
| +036+ | 1.93 | Lefty Gomez | 67.3 | NYA |
| +041+ | 1.69 | Pat Caraway | 107.3 | CHA |
| +043+ | 1.66 | Socks Seibold | 84.3 | ATL |
| +045+ | 1.65 | Watty Clark | 76 | LAN |
| +046+ | 1.65 | Bob Smith | 83.3 | CHN |
| +049+ | 1.55 | Red Lucas | 99.7 | CIN |
| +050+ | 1.48 | Carl Hubbell | 79 | SFN |
| +052+ | 1.42 | Burleigh Grimes | 89.7 | SLN |
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