| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Mays | NYA | 9.39 | 192105281_OAK_NYA |
| Jesse Barnes | SFN | 5.67 | 192105270_SFN_ATL |
| Stan Coveleski | CLE | 5.62 | 192105260_CLE_BAL |
| Pete Alexander | CHN | 4.06 | 192105270_SLN_CHN |
| Wilbur Cooper | PIT | 4.04 | 192105270_CIN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dutch Leonard | DET | -2.57 | 192105270_CHA_DET |
| Slim Harriss | OAK | -1.35 | 192105281_OAK_NYA |
| Ferdie Schupp | SLN | -1.04 | 192105281_SLN_CHN |
| Bernie Boland | BAL | -0.91 | 192105280_CLE_BAL |
| Dickey Kerr | CHA | -0.78 | 192105262_CHA_DET |
Based on accumulated WAA for this season up to 1921-05-28.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.25 | Carl Mays | 95 | NYA |
| +002+ | 4.71 | Red Faber | 92.7 | CHA |
| +005+ | 3.74 | Stan Coveleski | 93 | CLE |
| +012+ | 2.71 | Whitey Glazner | 63.7 | PIT |
| +013+ | 2.52 | George Mogridge | 59 | MIN |
| +014+ | 2.39 | Jesse Barnes | 68 | SFN |
| +015+ | 2.33 | Eppa Rixey | 70 | CIN |
| +016+ | 2.31 | Wilbur Cooper | 73 | PIT |
| +018+ | 2.27 | Sad Sam Jones | 82 | BOS |
| +020+ | 2.18 | Dana Fillingim | 57.7 | ATL |
| +021+ | 2.15 | Rube Benton | 36.3 | SFN |
| +025+ | 1.72 | Burleigh Grimes | 59 | LAN |
| +028+ | 1.67 | Waite Hoyt | 67.7 | NYA |
| +034+ | 1.45 | Earl Hamilton | 63.7 | PIT |
| +037+ | 1.39 | Dutch Ruether | 69 | LAN |
| XXXXX | 1.13 | Herb Pennock | 50.7 | BOS |
| XXXXX | 1.12 | Bill Pertica | 55 | SLN |
| XXXXX | 1.06 | Hugh McQuillan | 66 | ATL |
| XXXXX | 1.04 | Lefty Tyler | 20 | CHN |
| XXXXX | 0.97 | Dolf Luque | 82 | CIN |
| XXXXX | 0.92 | George Uhle | 67 | CLE |
| XXXXX | 0.84 | Phil Douglas | 31.3 | SFN |
| XXXXX | 0.8 | Rosy Ryan | 37.7 | SFN |
| XXXXX | 0.79 | Dave Keefe | 42.7 | OAK |
| XXXXX | 0.76 | Mule Watson | 67.3 | ATL |
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