| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 12.85 | 193106080_DET_OAK |
| Burleigh Grimes | SLN | 5.25 | 193106071_LAN_SLN |
| Lefty Stewart | BAL | 3.66 | 193106080_BAL_BOS |
| Pat Caraway | CHA | 3.38 | 193106060_CHA_MIN |
| Freddie Fitzsimmons | SFN | 2.84 | 193106070_SFN_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ownie Carroll | CIN | -3.21 | 193106072_ATL_CIN |
| Roy Sherid | NYA | -1.23 | 193106060_CLE_NYA |
| Dick Coffman | BAL | -1.01 | 193106060_BAL_BOS |
| Roy Mahaffey | OAK | -0.76 | 193106070_OAK_DET |
| Guy Bush | CHN | -0.38 | 193106070_SFN_CHN |
Based on accumulated WAA for this season up to 1931-06-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.59 | Lefty Grove | 99.3 | OAK |
| +002+ | 4.04 | Lloyd Brown | 102 | MIN |
| +011+ | 3.13 | Tom Zachary | 65 | ATL |
| +013+ | 3.03 | Pat Caraway | 95 | CHA |
| +015+ | 2.97 | Clarence Mitchell | 81 | SFN |
| +016+ | 2.73 | George Uhle | 59.3 | DET |
| +020+ | 2.33 | Freddie Fitzsimmons | 83 | SFN |
| +021+ | 2.22 | Sam Jones | 78 | MIN |
| +023+ | 2.06 | Bob Smith | 70 | CHN |
| +024+ | 2.04 | Heinie Meine | 92 | PIT |
| +025+ | 1.97 | Ed Brandt | 83.3 | ATL |
| +026+ | 1.96 | Jack Berly | 53 | SFN |
| +027+ | 1.95 | Ray Benge | 73.3 | PHI |
| +028+ | 1.89 | Rube Walberg | 98 | OAK |
| +029+ | 1.79 | Ed Morris | 42 | BOS |
| +030+ | 1.72 | George Earnshaw | 94 | OAK |
| +031+ | 1.69 | Lefty Stewart | 90 | BAL |
| +032+ | 1.68 | Charlie Root | 68.3 | CHN |
| +033+ | 1.65 | Lefty Gomez | 57.3 | NYA |
| +034+ | 1.64 | Bill Hallahan | 72 | SLN |
| +035+ | 1.63 | Si Johnson | 84.7 | CIN |
| +037+ | 1.6 | Ray Kremer | 85.3 | PIT |
| +036+ | 1.6 | Burleigh Grimes | 76 | SLN |
| +042+ | 1.5 | Bill Walker | 61.3 | SFN |
| +050+ | 1.4 | Les Sweetland | 48.3 | CHN |
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