| Starter | Tm | Tier | Game |
|---|---|---|---|
| Burleigh Grimes | SLN | 6.21 | 193105170_SLN_SFN |
| Lefty Grove | OAK | 6.08 | 193105160_OAK_CLE |
| Bill Walker | SFN | 5.18 | 193105180_SLN_SFN |
| Charlie Root | CHN | 3.03 | 193105161_CHN_PHI |
| Wes Ferrell | CLE | 2.42 | 193105170_OAK_CLE |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Clise Dudley | PHI | -2.39 | 193105161_CHN_PHI |
| Les Sweetland | CHN | -1.63 | 193105162_CHN_PHI |
| Hank Johnson | NYA | -1.04 | 193105160_NYA_DET |
| Heinie Meine | PIT | -0.49 | 193105170_PIT_ATL |
| Tommy Bridges | DET | -0.36 | 193105160_NYA_DET |
Based on accumulated WAA for this season up to 1931-05-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 3.2 | Lloyd Brown | 71.7 | MIN |
| +004+ | 2.81 | Burleigh Grimes | 48 | SLN |
| +005+ | 2.69 | Ed Brandt | 54 | ATL |
| +006+ | 2.66 | Freddie Fitzsimmons | 57 | SFN |
| +010+ | 2.23 | Bill Walker | 43 | SFN |
| +011+ | 2.21 | Socks Seibold | 49 | ATL |
| +015+ | 1.79 | Pat Caraway | 58.3 | CHA |
| +016+ | 1.77 | Tom Zachary | 42.3 | ATL |
| +017+ | 1.72 | Wilcy Moore | 39.7 | BOS |
| +020+ | 1.66 | Clarence Mitchell | 46 | SFN |
| +022+ | 1.64 | Earl Whitehill | 61 | DET |
| +023+ | 1.62 | Eddie Rommel | 28 | OAK |
| +024+ | 1.62 | Lefty Grove | 43.3 | OAK |
| +028+ | 1.46 | Rube Walberg | 63.7 | OAK |
| +029+ | 1.43 | Heinie Meine | 61 | PIT |
| +031+ | 1.34 | Jesse Haines | 30 | SLN |
| XXXXX | 1.19 | Jack Berly | 20 | SFN |
| XXXXX | 1.1 | Ed Morris | 22.3 | BOS |
| XXXXX | 1.08 | Syl Johnson | 25 | SLN |
| XXXXX | 1.05 | Pat Malone | 35 | CHN |
| XXXXX | 0.96 | Red Lucas | 53 | CIN |
| XXXXX | 0.88 | Charlie Root | 46.3 | CHN |
| XXXXX | 0.85 | Ray Benge | 48.3 | PHI |
| XXXXX | 0.82 | Vic Sorrell | 59 | DET |
| XXXXX | 0.79 | Clint Brown | 49.7 | CLE |
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