| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 13.37 | 193106231_OAK_BAL |
| Lefty Stewart | BAL | 3.25 | 193106211_NYA_BAL |
| George Uhle | DET | 2.87 | 193106232_MIN_DET |
| Burleigh Grimes | SLN | 2.76 | 193106212_SLN_ATL |
| Watty Clark | LAN | 1.78 | 193106220_PIT_LAN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Guy Bush | CHN | -1.11 | 193106220_CHN_SFN |
| Spades Wood | PIT | -1.08 | 193106220_PIT_LAN |
| Ray Moss | ATL | -0.89 | 193106232_CIN_ATL |
| Waite Hoyt | DET | -0.85 | 193106231_MIN_DET |
| Larry Benton | CIN | -0.76 | 193106232_CIN_ATL |
Based on accumulated WAA for this season up to 1931-06-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.03 | Lefty Grove | 127 | OAK |
| +008+ | 4.3 | Freddie Fitzsimmons | 110 | SFN |
| +009+ | 3.92 | Tom Zachary | 82.7 | ATL |
| +010+ | 3.82 | Lloyd Brown | 120.3 | MIN |
| +014+ | 3.42 | Si Johnson | 112.7 | CIN |
| +017+ | 3.27 | George Earnshaw | 129.3 | OAK |
| +018+ | 3.21 | George Uhle | 87.3 | DET |
| +019+ | 3.07 | Bill Hallahan | 90 | SLN |
| +020+ | 2.93 | Clarence Mitchell | 98 | SFN |
| +022+ | 2.92 | Charlie Root | 93.3 | CHN |
| +025+ | 2.72 | Rube Walberg | 123.7 | OAK |
| +026+ | 2.67 | Ed Brandt | 102 | ATL |
| +027+ | 2.63 | Heinie Meine | 115 | PIT |
| +028+ | 2.6 | Red Lucas | 108.7 | CIN |
| +032+ | 2.45 | Burleigh Grimes | 98.7 | SLN |
| +034+ | 2.25 | Watty Clark | 86 | LAN |
| +039+ | 2.03 | Ray Benge | 92 | PHI |
| +040+ | 1.89 | Ray Kremer | 96.7 | PIT |
| +042+ | 1.75 | Bill Walker | 72.7 | SFN |
| +044+ | 1.68 | Jack Berly | 61 | SFN |
| +045+ | 1.66 | Socks Seibold | 96 | ATL |
| +047+ | 1.61 | Jim Lindsey | 31.7 | SLN |
| +049+ | 1.58 | Larry French | 119.3 | PIT |
| +048+ | 1.58 | Ed Morris | 61 | BOS |
| +050+ | 1.57 | Clise Dudley | 78.7 | PHI |
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