| Starter | Tm | Tier | Game |
|---|---|---|---|
| Stew Bolen | PHI | -1.29 | 193106142_PHI_SLN |
| Fred Frankhouse | ATL | -1.1 | 193106140_ATL_CHN |
| Vic Frazier | CHA | -0.79 | 193106150_CHA_BOS |
| Paul Derringer | SLN | -0.56 | 193106141_PHI_SLN |
| Guy Bush | CHN | -0.39 | 193106160_ATL_CHN |
Based on accumulated WAA for this season up to 1931-06-16.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.06 | Lefty Grove | 108.3 | OAK |
| +009+ | 3.66 | Lloyd Brown | 111 | MIN |
| +011+ | 3.41 | Freddie Fitzsimmons | 101 | SFN |
| +012+ | 3.22 | Charlie Root | 86.3 | CHN |
| +014+ | 3 | George Uhle | 68.3 | DET |
| +016+ | 2.98 | Clarence Mitchell | 90 | SFN |
| +017+ | 2.96 | Tom Zachary | 73.7 | ATL |
| +019+ | 2.84 | George Earnshaw | 112 | OAK |
| +021+ | 2.59 | Si Johnson | 103.7 | CIN |
| +024+ | 2.51 | Bill Hallahan | 81 | SLN |
| +025+ | 2.43 | Ed Morris | 51 | BOS |
| +027+ | 2.37 | Rube Walberg | 113.7 | OAK |
| +028+ | 2.31 | Sam Jones | 83 | MIN |
| +030+ | 2.12 | Ed Brandt | 93 | ATL |
| +033+ | 2.1 | Ray Benge | 86.7 | PHI |
| +034+ | 2.02 | Jack Berly | 56 | SFN |
| +035+ | 1.96 | Lefty Gomez | 67.3 | NYA |
| +038+ | 1.73 | Heinie Meine | 100 | PIT |
| +039+ | 1.73 | Pat Caraway | 107.3 | CHA |
| +041+ | 1.69 | Socks Seibold | 84.3 | ATL |
| +043+ | 1.66 | Bob Smith | 83.3 | CHN |
| +047+ | 1.45 | Burleigh Grimes | 89.7 | SLN |
| +052+ | 1.36 | Syl Johnson | 58 | SLN |
| +053+ | 1.33 | Dazzy Vance | 72.3 | LAN |
| +054+ | 1.3 | Red Lucas | 92.7 | CIN |
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