| Starter | Tm | Tier | Game |
|---|---|---|---|
| Stan Coveleski | CLE | 5.64 | 192105301_CLE_DET |
| Jesse Barnes | SFN | 5.64 | 192105310_PHI_SFN |
| Wilbur Cooper | PIT | 5.11 | 192105310_CHN_PIT |
| Red Faber | CHA | 2.15 | 192105302_BAL_CHA |
| Hippo Vaughn | CHN | 1.52 | 192105310_CHN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Eric Erickson | MIN | -2.98 | 192105290_BOS_MIN |
| Roy Wilkinson | CHA | -2.49 | 192105290_CHA_DET |
| Bob Hasty | OAK | -2.02 | 192105312_BOS_OAK |
| Jack Scott | ATL | -1.87 | 192105301_LAN_ATL |
| Hooks Dauss | DET | -1.38 | 192105310_CLE_DET |
Based on accumulated WAA for this season up to 1921-05-31.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 4.65 | Red Faber | 101.7 | CHA |
| +007+ | 3.61 | Stan Coveleski | 102 | CLE |
| +008+ | 3.49 | George Mogridge | 68 | MIN |
| +014+ | 2.7 | Whitey Glazner | 63.7 | PIT |
| +015+ | 2.65 | Eppa Rixey | 75.7 | CIN |
| +016+ | 2.49 | Wilbur Cooper | 82 | PIT |
| +017+ | 2.46 | Sad Sam Jones | 82 | BOS |
| +020+ | 2.28 | Dana Fillingim | 66 | ATL |
| +021+ | 2.2 | Jesse Barnes | 74 | SFN |
| +023+ | 2.14 | Herb Pennock | 59.7 | BOS |
| +024+ | 2.13 | Burleigh Grimes | 68 | LAN |
| +032+ | 1.68 | Jimmy Zinn | 34.3 | PIT |
| +034+ | 1.68 | Hugh McQuillan | 80 | ATL |
| +036+ | 1.63 | Earl Hamilton | 72.7 | PIT |
| +037+ | 1.62 | Fred Toney | 72.3 | SFN |
| +040+ | 1.48 | Dolf Luque | 92 | CIN |
| +041+ | 1.38 | Dutch Ruether | 69 | LAN |
| +046+ | 1.27 | Jimmy Ring | 74 | PHI |
| XXXXX | 1.2 | Marv Goodwin | 16.7 | SLN |
| XXXXX | 0.95 | Clarence Mitchell | 44 | LAN |
| XXXXX | 0.87 | Sherry Smith | 68 | LAN |
| XXXXX | 0.83 | Bill Pertica | 56 | SLN |
| XXXXX | 0.81 | Roy Moore | 46.7 | OAK |
| XXXXX | 0.72 | Mule Watson | 67.3 | ATL |
| XXXXX | 0.69 | Fritz Coumbe | 40 | CIN |
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