| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | BOS | 5.15 | 193807140_DET_BOS |
| Bill Lee | CHN | 4.87 | 193807142_PHI_CHN |
| Johnny Vander Meer | CIN | 3.93 | 193807150_SFN_CIN |
| Lou Fette | ATL | 3.33 | 193807140_ATL_SLN |
| Cy Blanton | PIT | 2.4 | 193807140_LAN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wes Ferrell | MIN | -3.07 | 193807150_CHA_MIN |
| Bobo Newsom | BAL | -2.3 | 193807140_BAL_NYA |
| Wayne LaMaster | PHI | -1.59 | 193807150_PHI_CHN |
| Bud Thomas | OAK | -1.34 | 193807140_CHA_OAK |
| Vern Kennedy | DET | -0.65 | 193807131_DET_BOS |
Based on accumulated WAA for this season up to 1938-07-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 6.91 | Johnny Vander Meer | 144.3 | CIN |
| +006+ | 5.22 | Bill Lee | 144 | CHN |
| +009+ | 4.79 | Cliff Melton | 142.3 | SFN |
| +011+ | 4.42 | Lefty Grove | 149.7 | BOS |
| +012+ | 4.39 | Paul Derringer | 155 | CIN |
| +015+ | 3.84 | Carl Hubbell | 116 | SFN |
| +018+ | 3.48 | Lou Fette | 124.7 | ATL |
| +020+ | 3.42 | Johnny Allen | 134 | CLE |
| +022+ | 3.33 | Bill McGee | 113.3 | SLN |
| +021+ | 3.33 | Bob Klinger | 86 | PIT |
| +024+ | 3.16 | Danny MacFayden | 87.3 | ATL |
| +025+ | 3.15 | Larry French | 136 | CHN |
| +026+ | 3.11 | Bob Feller | 141.3 | CLE |
| +029+ | 2.98 | Tot Pressnell | 123.3 | LAN |
| +030+ | 2.92 | Clay Bryant | 125.3 | CHN |
| +034+ | 2.83 | Red Ruffing | 124 | NYA |
| +036+ | 2.74 | Ted Lyons | 93.7 | CHA |
| +039+ | 2.68 | Hal Schumacher | 123.3 | SFN |
| +042+ | 2.52 | Freddie Fitzsimmons | 112.3 | LAN |
| +043+ | 2.5 | Cy Blanton | 75.3 | PIT |
| +045+ | 2.46 | Jack Wilson | 91.7 | BOS |
| +046+ | 2.32 | George Caster | 134.7 | OAK |
| +048+ | 2.31 | Russ Bauers | 123 | PIT |
| +050+ | 2.23 | Bill Swift | 92 | PIT |
| +051+ | 2.12 | Peaches Davis | 98 | CIN |
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