| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Mays | NYA | 10.12 | 192106010_NYA_MIN |
| Jesse Barnes | SFN | 5.64 | 192105310_PHI_SFN |
| Stan Coveleski | CLE | 5.64 | 192105301_CLE_DET |
| Wilbur Cooper | PIT | 5.11 | 192105310_CHN_PIT |
| Dutch Ruether | LAN | 4.09 | 192106010_LAN_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Hasty | OAK | -2.02 | 192105312_BOS_OAK |
| Jack Scott | ATL | -1.87 | 192105301_LAN_ATL |
| Hooks Dauss | DET | -1.38 | 192105310_CLE_DET |
| Elmer Myers | BOS | -1.08 | 192105311_BOS_OAK |
| Rip Collins | NYA | -1.01 | 192105301_NYA_MIN |
Based on accumulated WAA for this season up to 1921-06-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.84 | Carl Mays | 103.7 | NYA |
| +002+ | 4.66 | Red Faber | 101.7 | CHA |
| +007+ | 3.61 | Stan Coveleski | 102 | CLE |
| +008+ | 3.49 | George Mogridge | 68 | MIN |
| +010+ | 3.32 | Whitey Glazner | 72.7 | PIT |
| +013+ | 3.05 | Rube Benton | 45.3 | SFN |
| +016+ | 2.73 | Sad Sam Jones | 91 | BOS |
| +017+ | 2.5 | Wilbur Cooper | 82 | PIT |
| +020+ | 2.29 | Dana Fillingim | 66 | ATL |
| +021+ | 2.2 | Jesse Barnes | 74 | SFN |
| +023+ | 2.14 | Burleigh Grimes | 68 | LAN |
| +022+ | 2.14 | Herb Pennock | 59.7 | BOS |
| +031+ | 1.72 | Eppa Rixey | 81.3 | CIN |
| +034+ | 1.69 | Jimmy Zinn | 34.3 | PIT |
| +033+ | 1.69 | Hugh McQuillan | 80 | ATL |
| +035+ | 1.64 | Earl Hamilton | 72.7 | PIT |
| +038+ | 1.62 | Fred Toney | 72.3 | SFN |
| +040+ | 1.54 | Rosy Ryan | 49.3 | SFN |
| +042+ | 1.48 | Dolf Luque | 92 | CIN |
| +045+ | 1.39 | Dutch Ruether | 78 | LAN |
| XXXXX | 1.2 | Marv Goodwin | 16.7 | SLN |
| XXXXX | 0.95 | Clarence Mitchell | 44 | LAN |
| XXXXX | 0.88 | Sherry Smith | 68 | LAN |
| XXXXX | 0.83 | Bill Pertica | 56 | SLN |
| XXXXX | 0.69 | Fritz Coumbe | 40 | CIN |
_