| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Walker | SFN | 4.14 | 193106100_SFN_PIT |
| Tom Zachary | ATL | 3.2 | 193106100_ATL_SLN |
| George Earnshaw | OAK | 2.82 | 193106090_DET_OAK |
| Lloyd Brown | MIN | 2.57 | 193106110_CLE_MIN |
| Charlie Root | CHN | 2.53 | 193106100_PHI_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Phil Collins | PHI | -0.74 | 193106100_PHI_CHN |
| Les Sweetland | CHN | -0.6 | 193106090_SFN_CHN |
| Ray Moss | ATL | -0.39 | 193106090_ATL_CIN |
| Erv Brame | PIT | -0.18 | 193106090_PHI_PIT |
| Benny Frey | CIN | -0.16 | 193106090_ATL_CIN |
Based on accumulated WAA for this season up to 1931-06-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.64 | Lefty Grove | 99.3 | OAK |
| +008+ | 3.52 | Lloyd Brown | 104.7 | MIN |
| +009+ | 3.33 | Tom Zachary | 73 | ATL |
| +012+ | 3 | Clarence Mitchell | 81 | SFN |
| +015+ | 2.84 | Pat Caraway | 103 | CHA |
| +016+ | 2.77 | George Uhle | 59.3 | DET |
| +019+ | 2.6 | Charlie Root | 77.3 | CHN |
| +020+ | 2.55 | Bob Smith | 79 | CHN |
| +022+ | 2.5 | Si Johnson | 95.7 | CIN |
| +024+ | 2.35 | Freddie Fitzsimmons | 83 | SFN |
| +025+ | 2.32 | Sam Jones | 83 | MIN |
| +026+ | 2.22 | George Earnshaw | 103 | OAK |
| +027+ | 2.05 | Jack Berly | 56 | SFN |
| +028+ | 2.03 | Ed Brandt | 83.3 | ATL |
| +032+ | 1.81 | Ed Morris | 42 | BOS |
| +033+ | 1.79 | Ray Benge | 77.3 | PHI |
| +034+ | 1.77 | Heinie Meine | 100 | PIT |
| +036+ | 1.74 | Lefty Stewart | 90 | BAL |
| +038+ | 1.68 | Bill Hallahan | 72 | SLN |
| +039+ | 1.68 | Lefty Gomez | 57.3 | NYA |
| +040+ | 1.64 | Burleigh Grimes | 76 | SLN |
| +041+ | 1.64 | Socks Seibold | 83.7 | ATL |
| +043+ | 1.6 | Ray Kremer | 85.3 | PIT |
| +046+ | 1.54 | Rube Walberg | 104.7 | OAK |
| +053+ | 1.38 | Syl Johnson | 58 | SLN |
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