| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bucky Walters | CIN | 12.41 | 193909200_PHI_CIN |
| Lefty Grove | BOS | 3.15 | 193909200_BAL_BOS |
| Hugh Casey | LAN | 2.68 | 193909200_LAN_SLN |
| Bob Bowman | SLN | 2.14 | 193909200_LAN_SLN |
| Ted Lyons | CHA | 2.01 | 193909200_CHA_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Nels Potter | OAK | -7.53 | 193909190_DET_OAK |
| Jack Kramer | BAL | -3.68 | 193909210_BAL_BOS |
| Cotton Pippen | DET | -2.59 | 193909210_DET_OAK |
| Bill Dietrich | CHA | -0.64 | 193909210_CHA_NYA |
| Jack Wilson | BOS | -0.61 | 193909190_BAL_BOS |
Based on accumulated WAA for this season up to 1939-09-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 13.74 | Bucky Walters | 297 | CIN |
| +005+ | 8.74 | Bob Feller | 270 | CLE |
| +008+ | 7.55 | Paul Derringer | 283 | CIN |
| +011+ | 7.2 | Red Ruffing | 233.3 | NYA |
| +012+ | 7.09 | Lefty Grove | 182 | BOS |
| +016+ | 6.05 | Claude Passeau | 259.3 | TOT |
| +018+ | 5.87 | Bob Bowman | 163 | SLN |
| +019+ | 5.82 | Carl Hubbell | 145 | SFN |
| +021+ | 5.79 | Ted Lyons | 163.7 | CHA |
| +022+ | 5.77 | Hugh Casey | 207.7 | LAN |
| +028+ | 5 | Marius Russo | 116 | NYA |
| +030+ | 4.73 | Bump Hadley | 145 | NYA |
| +033+ | 4.52 | Dutch Leonard | 252.3 | MIN |
| +034+ | 4.39 | Bill Lee | 267.3 | CHN |
| +036+ | 4.24 | Lou Fette | 146 | ATL |
| +037+ | 4.17 | Mace Brown | 194 | PIT |
| +038+ | 4.14 | Steve Sundra | 113.7 | NYA |
| +042+ | 3.78 | Bobo Newsom | 271.7 | TOT |
| +044+ | 3.75 | Milt Shoffner | 162.7 | TOT |
| +045+ | 3.75 | Mort Cooper | 186.3 | SLN |
| +046+ | 3.72 | Lefty Gomez | 192 | NYA |
| +047+ | 3.68 | Junior Thompson | 128.7 | CIN |
| +049+ | 3.56 | Larry French | 179.7 | CHN |
| +050+ | 3.49 | Oral Hildebrand | 117.7 | NYA |
| +051+ | 3.44 | Cliff Melton | 198.3 | SFN |
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