| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lynn Nelson | OAK | -2.83 | 193809100_OAK_BOS |
| Ken Chase | MIN | -2.71 | 193809080_OAK_MIN |
| Bobo Newsom | BAL | -2.67 | 193809100_BAL_CLE |
| Earl Whitehill | CLE | -0.79 | 193809080_DET_CLE |
| Bucky Walters | CIN | -0.36 | 193809100_CIN_CHN |
Based on accumulated WAA for this season up to 1938-09-10.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +008+ | 7.15 | Bill Lee | 245.7 | CHN |
| +009+ | 7.13 | Lou Fette | 226 | ATL |
| +012+ | 6.87 | Paul Derringer | 265 | CIN |
| +017+ | 6.53 | Danny MacFayden | 184 | ATL |
| +020+ | 6.07 | Freddie Fitzsimmons | 176.7 | LAN |
| +023+ | 5.69 | Johnny Vander Meer | 189.3 | CIN |
| +024+ | 5.64 | Clay Bryant | 228.3 | CHN |
| +028+ | 5.09 | Red Ruffing | 218.3 | NYA |
| +029+ | 5.07 | Carl Hubbell | 179 | SFN |
| +030+ | 4.99 | Thornton Lee | 209.3 | CHA |
| +031+ | 4.89 | Bill McGee | 197 | SLN |
| +032+ | 4.76 | Dutch Leonard | 204.3 | MIN |
| +033+ | 4.62 | Charlie Root | 133.3 | CHN |
| +035+ | 4.59 | Russ Bauers | 203.7 | PIT |
| +040+ | 4.13 | Bob Klinger | 136.7 | PIT |
| +047+ | 3.63 | Jim Tobin | 200.3 | PIT |
| +048+ | 3.53 | Ted Lyons | 161.7 | CHA |
| +049+ | 3.42 | Lefty Gomez | 210 | NYA |
| +050+ | 3.41 | Ira Hutchinson | 121 | ATL |
| +054+ | 3.14 | Lon Warneke | 187.7 | SLN |
| +055+ | 3.13 | Bob Weiland | 215.3 | SLN |
| +056+ | 2.94 | Jim Turner | 230.3 | ATL |
| +057+ | 2.92 | Bill Swift | 128.7 | PIT |
| +058+ | 2.91 | Bump Hadley | 139.3 | NYA |
| +060+ | 2.76 | Johnny Rigney | 127 | CHA |
_