| 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 |
| Pat Caraway | CHA | 2.43 | 193106130_CHA_NYA |
| Lloyd Brown | MIN | 2.04 | 193106150_BAL_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Stew Bolen | PHI | -1.29 | 193106142_PHI_SLN |
| Fred Frankhouse | ATL | -1.1 | 193106140_ATL_CHN |
| Milt Shoffner | CLE | -1.01 | 193106130_CLE_MIN |
| Larry Benton | CIN | -0.94 | 193106130_LAN_CIN |
| Vic Frazier | CHA | -0.79 | 193106150_CHA_BOS |
Based on accumulated WAA for this season up to 1931-06-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.05 | Lefty Grove | 108.3 | OAK |
| +009+ | 3.65 | Lloyd Brown | 111 | MIN |
| +011+ | 3.33 | Tom Zachary | 73.3 | ATL |
| +012+ | 3.02 | Charlie Root | 84.3 | CHN |
| +014+ | 2.99 | George Uhle | 68.3 | DET |
| +015+ | 2.97 | Clarence Mitchell | 90 | SFN |
| +019+ | 2.83 | George Earnshaw | 112 | OAK |
| +020+ | 2.75 | Freddie Fitzsimmons | 92 | SFN |
| +022+ | 2.5 | Bill Hallahan | 81 | SLN |
| +023+ | 2.43 | Si Johnson | 95.7 | CIN |
| +024+ | 2.43 | Ed Morris | 51 | BOS |
| +026+ | 2.37 | Rube Walberg | 113.7 | OAK |
| +027+ | 2.29 | Sam Jones | 83 | MIN |
| +031+ | 2.02 | Jack Berly | 56 | SFN |
| +033+ | 1.99 | Ed Brandt | 92 | ATL |
| +034+ | 1.95 | Lefty Gomez | 67.3 | NYA |
| +035+ | 1.73 | Heinie Meine | 100 | PIT |
| +036+ | 1.72 | Pat Caraway | 107.3 | CHA |
| +039+ | 1.69 | Ray Benge | 78.3 | PHI |
| +041+ | 1.66 | Bob Smith | 83.3 | CHN |
| +043+ | 1.6 | Socks Seibold | 83.7 | ATL |
| +051+ | 1.35 | Syl Johnson | 58 | SLN |
| +054+ | 1.32 | Dazzy Vance | 72.3 | LAN |
| +053+ | 1.32 | Carl Fischer | 79.3 | MIN |
| +056+ | 1.3 | Red Lucas | 92.7 | CIN |
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