| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ownie Carroll | CIN | -3 | 193105311_CIN_SLN |
| Stew Bolen | PHI | -0.33 | 193105310_PHI_SFN |
| Hank McDonald | OAK | -0.22 | 193105312_OAK_BOS |
| Carl Fischer | MIN | -0.22 | 193106020_DET_MIN |
| Tony Kaufmann | SLN | -0.15 | 193106010_CIN_SLN |
Based on accumulated WAA for this season up to 1931-06-02.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.38 | Lefty Grove | 75.3 | OAK |
| +003+ | 3.99 | Pat Caraway | 92.3 | CHA |
| +007+ | 3.18 | Lloyd Brown | 93 | MIN |
| +011+ | 2.97 | Ed Brandt | 78 | ATL |
| +013+ | 2.87 | Freddie Fitzsimmons | 79 | SFN |
| +017+ | 2.33 | Rube Walberg | 91 | OAK |
| +018+ | 2.3 | Tom Zachary | 56 | ATL |
| +019+ | 2.29 | Burleigh Grimes | 70 | SLN |
| +020+ | 2.21 | Heinie Meine | 84 | PIT |
| +022+ | 2.02 | Ray Benge | 66 | PHI |
| +023+ | 1.95 | Jack Berly | 45 | SFN |
| +024+ | 1.91 | Bill Walker | 55.7 | SFN |
| +026+ | 1.82 | Si Johnson | 73.7 | CIN |
| +028+ | 1.62 | George Uhle | 48.3 | DET |
| +030+ | 1.56 | Clarence Mitchell | 63 | SFN |
| +035+ | 1.4 | Sam Jones | 67 | MIN |
| +037+ | 1.35 | Ed Morris | 33 | BOS |
| +038+ | 1.33 | Bob Smith | 61 | CHN |
| +040+ | 1.31 | Dazzy Vance | 49 | LAN |
| +043+ | 1.25 | Earl Whitehill | 85 | DET |
| XXXXX | 1.23 | Jesse Haines | 48 | SLN |
| XXXXX | 1.21 | Carl Hubbell | 52.7 | SFN |
| XXXXX | 1.17 | Syl Johnson | 43 | SLN |
| XXXXX | 1.14 | Bruce Cunningham | 33.3 | ATL |
| XXXXX | 1.11 | Les Sweetland | 39.3 | CHN |
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