| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 17.45 | 193107131_MIN_OAK |
| Bill Walker | SFN | 5.64 | 193107112_SFN_PHI |
| Charlie Root | CHN | 2.93 | 193107121_CHN_SLN |
| George Uhle | DET | 1.94 | 193107111_BAL_DET |
| Firpo Marberry | MIN | 1.75 | 193107131_MIN_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Les Sweetland | CHN | -2.61 | 193107111_CHN_PIT |
| Waite Hoyt | OAK | -1.7 | 193107121_OAK_BOS |
| Stew Bolen | PHI | -1.45 | 193107121_PHI_SFN |
| Red Ruffing | NYA | -1.22 | 193107110_OAK_NYA |
| Ray Kolp | CIN | -0.83 | 193107110_CIN_SLN |
Based on accumulated WAA for this season up to 1931-07-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 8.28 | Lefty Grove | 169 | OAK |
| +009+ | 5.11 | Freddie Fitzsimmons | 144.7 | SFN |
| +014+ | 3.84 | Watty Clark | 110.7 | LAN |
| +015+ | 3.8 | Lloyd Brown | 153 | MIN |
| +016+ | 3.73 | Ed Brandt | 133.7 | ATL |
| +020+ | 3.63 | George Earnshaw | 173 | OAK |
| +021+ | 3.49 | Ray Kremer | 142.3 | PIT |
| +022+ | 3.47 | Tom Zachary | 107.7 | ATL |
| +023+ | 3.45 | Ray Benge | 135.7 | PHI |
| +026+ | 3.05 | Heinie Meine | 140 | PIT |
| +028+ | 2.91 | Carl Hubbell | 114 | SFN |
| +030+ | 2.85 | Bill Walker | 107 | SFN |
| +031+ | 2.77 | Dazzy Vance | 112.7 | LAN |
| +032+ | 2.63 | Bill Hallahan | 129.7 | SLN |
| +036+ | 2.51 | Charlie Root | 125.3 | CHN |
| +037+ | 2.46 | Si Johnson | 143 | CIN |
| +039+ | 2.25 | Socks Seibold | 123 | ATL |
| +047+ | 1.93 | Fred Frankhouse | 70.7 | ATL |
| +049+ | 1.92 | Rube Walberg | 166.3 | OAK |
| +048+ | 1.92 | George Uhle | 110.3 | DET |
| +050+ | 1.91 | Jack Ogden | 45.3 | CIN |
| +055+ | 1.81 | Clarence Mitchell | 122 | SFN |
| +056+ | 1.73 | Frank Watt | 70 | PHI |
| +058+ | 1.68 | Ed Wells | 62.3 | NYA |
| +062+ | 1.63 | Lefty Gomez | 102.7 | NYA |
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