| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 12.85 | 193106080_DET_OAK |
| Burleigh Grimes | SLN | 5.25 | 193106071_LAN_SLN |
| Lefty Stewart | BAL | 3.66 | 193106080_BAL_BOS |
| Freddie Fitzsimmons | SFN | 2.84 | 193106070_SFN_CHN |
| Pat Malone | CHN | 2.77 | 193106080_SFN_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ownie Carroll | CIN | -3.21 | 193106072_ATL_CIN |
| Roy Mahaffey | OAK | -0.76 | 193106070_OAK_DET |
| Clise Dudley | PHI | -0.67 | 193106090_PHI_PIT |
| Les Sweetland | CHN | -0.6 | 193106090_SFN_CHN |
| Ray Moss | ATL | -0.39 | 193106090_ATL_CIN |
Based on accumulated WAA for this season up to 1931-06-09.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.62 | Lefty Grove | 99.3 | OAK |
| +003+ | 4.07 | Lloyd Brown | 102 | MIN |
| +010+ | 3.17 | Tom Zachary | 65 | ATL |
| +013+ | 3 | Clarence Mitchell | 81 | SFN |
| +015+ | 2.82 | Pat Caraway | 103 | CHA |
| +016+ | 2.76 | George Uhle | 59.3 | DET |
| +021+ | 2.35 | Freddie Fitzsimmons | 83 | SFN |
| +022+ | 2.25 | Sam Jones | 78 | MIN |
| +023+ | 2.2 | George Earnshaw | 103 | OAK |
| +024+ | 2.07 | Bob Smith | 70 | CHN |
| +025+ | 2.07 | Heinie Meine | 92 | PIT |
| +026+ | 2.01 | Ed Brandt | 83.3 | ATL |
| +027+ | 1.98 | Ray Benge | 73.3 | PHI |
| +028+ | 1.97 | Jack Berly | 53 | SFN |
| +030+ | 1.92 | Rube Walberg | 98 | OAK |
| +031+ | 1.81 | Ed Morris | 42 | BOS |
| +032+ | 1.72 | Lefty Stewart | 90 | BAL |
| +033+ | 1.7 | Charlie Root | 68.3 | CHN |
| +035+ | 1.66 | Lefty Gomez | 57.3 | NYA |
| +036+ | 1.66 | Bill Hallahan | 72 | SLN |
| +037+ | 1.65 | Si Johnson | 84.7 | CIN |
| +038+ | 1.63 | Burleigh Grimes | 76 | SLN |
| +039+ | 1.62 | Ray Kremer | 85.3 | PIT |
| +041+ | 1.52 | Bill Walker | 61.3 | SFN |
| XXXXX | 1.19 | Jakie May | 33.3 | CHN |
_