| Starter | Tm | Tier | Game |
|---|---|---|---|
| Lefty Grove | BOS | 5.47 | 193807010_BOS_OAK |
| Johnny Allen | CLE | 4.78 | 193807031_CLE_CHA |
| Carl Hubbell | SFN | 4.56 | 193807020_SFN_LAN |
| Bill Lee | CHN | 4.44 | 193807030_CHN_CIN |
| Paul Derringer | CIN | 2.36 | 193807010_CHN_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wayne LaMaster | PHI | -2.73 | 193807012_PHI_ATL |
| Wes Ferrell | MIN | -2.69 | 193807020_MIN_NYA |
| Bobo Newsom | BAL | -2.25 | 193807032_DET_BAL |
| Vern Kennedy | DET | -1.2 | 193807031_DET_BAL |
| Charlie Wagner | BOS | -1.04 | 193807020_BOS_OAK |
Based on accumulated WAA for this season up to 1938-07-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 5.66 | Johnny Vander Meer | 126.3 | CIN |
| +008+ | 4.39 | Bill Lee | 128 | CHN |
| +009+ | 4.26 | Carl Hubbell | 113 | SFN |
| +010+ | 4.17 | Cliff Melton | 133.3 | SFN |
| +012+ | 3.88 | Johnny Allen | 127 | CLE |
| +013+ | 3.68 | Lefty Grove | 136.7 | BOS |
| +014+ | 3.56 | Paul Derringer | 137 | CIN |
| +017+ | 3.3 | Bob Feller | 117 | CLE |
| +019+ | 3.22 | Bob Klinger | 74.7 | PIT |
| +021+ | 3.09 | Bill McGee | 99 | SLN |
| +022+ | 3.03 | Danny MacFayden | 87.3 | ATL |
| +025+ | 2.97 | Tot Pressnell | 106.3 | LAN |
| +029+ | 2.8 | Red Ruffing | 108.3 | NYA |
| +031+ | 2.67 | Jack Wilson | 85.7 | BOS |
| +032+ | 2.65 | Clay Bryant | 104.3 | CHN |
| +033+ | 2.62 | Ted Lyons | 84.7 | CHA |
| +034+ | 2.6 | Lou Fette | 106.7 | ATL |
| +035+ | 2.4 | Bill Swift | 72.7 | PIT |
| +036+ | 2.32 | Freddie Fitzsimmons | 97.7 | LAN |
| +038+ | 2.29 | Monty Stratton | 66.7 | CHA |
| +039+ | 2.25 | Ira Hutchinson | 57.7 | ATL |
| +044+ | 2.04 | Larry French | 108.7 | CHN |
| +048+ | 1.93 | Dizzy Dean | 25.7 | CHN |
| +051+ | 1.91 | George Caster | 119.7 | OAK |
| +053+ | 1.86 | Jim Bagby | 75.7 | BOS |
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