| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 14.11 | 193106131_BAL_OAK |
| Lefty Stewart | BAL | 5.32 | 193106131_BAL_OAK |
| Charlie Root | CHN | 3.67 | 193106140_ATL_CHN |
| Burleigh Grimes | SLN | 3.63 | 193106120_ATL_SLN |
| Wes Ferrell | CLE | 3.12 | 193106120_CLE_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Les Sweetland | CHN | -1.46 | 193106120_PHI_CHN |
| Stew Bolen | PHI | -1.29 | 193106142_PHI_SLN |
| Fred Frankhouse | ATL | -1.1 | 193106140_ATL_CHN |
| Dick Coffman | BAL | -1.06 | 193106120_BAL_OAK |
| Milt Shoffner | CLE | -1.01 | 193106130_CLE_MIN |
Based on accumulated WAA for this season up to 1931-06-14.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.07 | Lefty Grove | 108.3 | OAK |
| +010+ | 3.49 | Lloyd Brown | 104.7 | MIN |
| +011+ | 3.35 | Tom Zachary | 73.3 | ATL |
| +013+ | 3.04 | Charlie Root | 84.3 | CHN |
| +014+ | 2.99 | Clarence Mitchell | 90 | SFN |
| +015+ | 2.91 | George Uhle | 67.3 | DET |
| +018+ | 2.86 | George Earnshaw | 112 | OAK |
| +020+ | 2.77 | Freddie Fitzsimmons | 92 | SFN |
| +022+ | 2.52 | Bill Hallahan | 81 | SLN |
| +023+ | 2.51 | Bob Smith | 79 | CHN |
| +024+ | 2.46 | Ed Morris | 51 | BOS |
| +025+ | 2.45 | Si Johnson | 95.7 | CIN |
| +027+ | 2.31 | Sam Jones | 83 | MIN |
| +031+ | 2.03 | Jack Berly | 56 | SFN |
| +032+ | 2.01 | Ed Brandt | 92 | ATL |
| +034+ | 1.96 | Lefty Gomez | 67.3 | NYA |
| +036+ | 1.79 | Pat Caraway | 107.3 | CHA |
| +037+ | 1.75 | Heinie Meine | 100 | PIT |
| +039+ | 1.71 | Ray Benge | 78.3 | PHI |
| +043+ | 1.62 | Socks Seibold | 83.7 | ATL |
| +045+ | 1.52 | Rube Walberg | 104.7 | OAK |
| +050+ | 1.36 | Syl Johnson | 58 | SLN |
| +053+ | 1.33 | Carl Fischer | 79.3 | MIN |
| +052+ | 1.33 | Dazzy Vance | 72.3 | LAN |
| +055+ | 1.32 | Red Lucas | 92.7 | CIN |
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