| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jimmie DeShong | MIN | -5.06 | 193808200_MIN_BOS |
| Wes Ferrell | NYA | -4.1 | 193808181_NYA_MIN |
| Bobo Newsom | BAL | -4.05 | 193808180_BAL_CLE |
| Hugh Mulcahy | PHI | -1.72 | 193808200_PHI_SFN |
| Buck Ross | OAK | -1.58 | 193808200_NYA_OAK |
Based on accumulated WAA for this season up to 1938-08-20.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 6.97 | Paul Derringer | 225 | CIN |
| +006+ | 6.36 | Danny MacFayden | 155 | ATL |
| +007+ | 6.34 | Bill Lee | 207.7 | CHN |
| +012+ | 5.94 | Lou Fette | 184.7 | ATL |
| +016+ | 5.45 | Johnny Vander Meer | 180 | CIN |
| +020+ | 4.96 | Carl Hubbell | 179 | SFN |
| +021+ | 4.95 | Bill McGee | 157 | SLN |
| +024+ | 4.64 | Red Ruffing | 179 | NYA |
| +025+ | 4.4 | Lefty Grove | 157.7 | BOS |
| +026+ | 4.38 | Dutch Leonard | 171 | MIN |
| +030+ | 4.2 | Russ Bauers | 176.3 | PIT |
| +035+ | 3.82 | Freddie Fitzsimmons | 145.7 | LAN |
| +036+ | 3.69 | Bob Weiland | 178.3 | SLN |
| +037+ | 3.61 | Larry French | 184.3 | CHN |
| +039+ | 3.58 | Lon Warneke | 158 | SLN |
| +041+ | 3.52 | Bill Lohrman | 105.3 | SFN |
| +042+ | 3.41 | Thornton Lee | 176 | CHA |
| +043+ | 3.41 | Jim Tobin | 174.7 | PIT |
| +045+ | 3.19 | Tot Pressnell | 160.3 | LAN |
| +046+ | 3.17 | Ira Hutchinson | 106 | ATL |
| +049+ | 3.1 | Clay Bryant | 181.3 | CHN |
| +050+ | 2.99 | Dizzy Dean | 59.7 | CHN |
| +054+ | 2.74 | Cy Blanton | 122.7 | PIT |
| +055+ | 2.73 | Cliff Melton | 182 | SFN |
| +056+ | 2.71 | Bob Klinger | 118 | PIT |
_