| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | OAK | 9.19 | 193105301_OAK_BOS |
| Bill Walker | SFN | 8.19 | 193105302_LAN_SFN |
| Burleigh Grimes | SLN | 7.44 | 193105290_CIN_SLN |
| Lefty Stewart | BAL | 3.46 | 193105280_BAL_CLE |
| Pat Malone | CHN | 3.18 | 193105290_CHN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ray Benge | PHI | -1.61 | 193105301_ATL_PHI |
| Les Sweetland | CHN | -1.46 | 193105301_CHN_PIT |
| Hank Johnson | NYA | -0.93 | 193105302_NYA_MIN |
| Larry Benton | CIN | -0.89 | 193105302_CIN_SLN |
| Ed Durham | BOS | -0.87 | 193105302_OAK_BOS |
Based on accumulated WAA for this season up to 1931-05-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.31 | Lefty Grove | 75.3 | OAK |
| +002+ | 3.91 | Pat Caraway | 85.3 | CHA |
| +008+ | 3.16 | Ed Brandt | 69.3 | ATL |
| +011+ | 2.92 | Freddie Fitzsimmons | 71 | SFN |
| +013+ | 2.68 | Lloyd Brown | 86 | MIN |
| +016+ | 2.46 | Heinie Meine | 76 | PIT |
| +019+ | 2.11 | Burleigh Grimes | 61 | SLN |
| +020+ | 1.99 | Ray Benge | 66 | PHI |
| +022+ | 1.93 | Jack Berly | 36 | SFN |
| +023+ | 1.89 | Bill Walker | 55.7 | SFN |
| +024+ | 1.87 | Tom Zachary | 46 | ATL |
| +025+ | 1.8 | Rube Walberg | 82 | OAK |
| +026+ | 1.7 | Si Johnson | 65.7 | CIN |
| +028+ | 1.53 | Clarence Mitchell | 63 | SFN |
| +029+ | 1.5 | Earl Whitehill | 77 | DET |
| +033+ | 1.45 | Dazzy Vance | 49 | LAN |
| +034+ | 1.38 | Wilcy Moore | 46.3 | BOS |
| +037+ | 1.35 | Sam Jones | 67 | MIN |
| +038+ | 1.29 | Socks Seibold | 57 | ATL |
| +040+ | 1.27 | Jesse Haines | 48 | SLN |
| XXXXX | 1.23 | Bruce Cunningham | 33.3 | ATL |
| XXXXX | 1.19 | Carl Hubbell | 52.7 | SFN |
| XXXXX | 1.17 | Jakie May | 27 | CHN |
| XXXXX | 1.17 | Charlie Root | 59.3 | CHN |
| XXXXX | 1.16 | Syl Johnson | 36 | SLN |
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