| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Hubbell | SFN | 5.49 | 193109100_SFN_PIT |
| Ray Kremer | PIT | 2.11 | 193109100_SFN_PIT |
| Bill Hallahan | SLN | 2.09 | 193109100_ATL_SLN |
| George Earnshaw | OAK | 1.58 | 193109100_BAL_OAK |
| Si Johnson | CIN | 1.05 | 193109110_LAN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Hank Johnson | NYA | -1.51 | 193109110_CHA_NYA |
| Tommy Bridges | DET | -1.24 | 193109100_DET_BOS |
| Socks Seibold | ATL | -0.36 | 193109100_ATL_SLN |
| Ted Lyons | CHA | -0.2 | 193109110_CHA_NYA |
| Danny MacFayden | BOS | -0.2 | 193109110_DET_BOS |
Based on accumulated WAA for this season up to 1931-09-11.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 12.79 | Lefty Grove | 258.7 | OAK |
| +006+ | 9.29 | Bill Walker | 222 | SFN |
| +008+ | 9.2 | Carl Hubbell | 238.7 | SFN |
| +012+ | 7.06 | Ed Brandt | 232.3 | ATL |
| +013+ | 6.93 | Freddie Fitzsimmons | 234.7 | SFN |
| +017+ | 5.82 | Larry French | 259 | PIT |
| +018+ | 5.62 | Bill Hallahan | 216.3 | SLN |
| +019+ | 5.45 | Tom Zachary | 202.3 | ATL |
| +023+ | 5.22 | Heinie Meine | 244 | PIT |
| +024+ | 5.2 | Lefty Gomez | 204.3 | NYA |
| +026+ | 4.73 | Ray Benge | 219.3 | PHI |
| +027+ | 4.71 | George Earnshaw | 262 | OAK |
| +029+ | 4.52 | Ray Kremer | 225.7 | PIT |
| +030+ | 4.48 | Bob Smith | 224.3 | CHN |
| +033+ | 4.32 | Lloyd Brown | 230.7 | MIN |
| +034+ | 4.22 | Watty Clark | 209.7 | LAN |
| +038+ | 3.86 | Jim Mooney | 55.7 | SFN |
| +041+ | 3.65 | Si Johnson | 251.7 | CIN |
| +042+ | 3.62 | Dazzy Vance | 205.7 | LAN |
| +043+ | 3.51 | Firpo Marberry | 191.3 | MIN |
| +044+ | 3.46 | Glenn Spencer | 161.7 | PIT |
| +047+ | 3.4 | Syl Johnson | 164.7 | SLN |
| +049+ | 3.34 | Charlie Root | 225.7 | CHN |
| +050+ | 3.12 | Jesse Haines | 122.3 | SLN |
| +052+ | 2.96 | Red Lucas | 210.7 | CIN |
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