| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Mays | NYA | 9.28 | 192105160_NYA_CLE |
| Fred Toney | SFN | 5.68 | 192105160_CIN_SFN |
| Stan Coveleski | CLE | 4.52 | 192105150_NYA_CLE |
| Hippo Vaughn | CHN | 2.55 | 192105160_CHN_ATL |
| Sherry Smith | LAN | 1.31 | 192105150_SLN_LAN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dutch Leonard | DET | -2.65 | 192105170_MIN_DET |
| Red Causey | PHI | -1.45 | 192105160_PIT_PHI |
| Scott Perry | OAK | -0.94 | 192105160_OAK_CHA |
| Ferdie Schupp | SLN | -0.85 | 192105150_SLN_LAN |
| Bullet Joe Bush | BOS | -0.72 | 192105160_BOS_BAL |
Based on accumulated WAA for this season up to 1921-05-17.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 4.39 | Carl Mays | 74.7 | NYA |
| +002+ | 4.25 | Red Faber | 64.7 | CHA |
| +005+ | 2.96 | Whitey Glazner | 49.7 | PIT |
| +007+ | 2.58 | Jesse Barnes | 55.7 | SFN |
| +010+ | 2.34 | Burleigh Grimes | 44 | LAN |
| +011+ | 2.25 | Stan Coveleski | 67 | CLE |
| +013+ | 2.01 | Wilbur Cooper | 46 | PIT |
| +014+ | 1.98 | Fred Toney | 56 | SFN |
| +015+ | 1.94 | Eppa Rixey | 56.3 | CIN |
| +016+ | 1.92 | George Mogridge | 43 | MIN |
| +021+ | 1.59 | Red Causey | 34 | PHI |
| +022+ | 1.55 | Herb Pennock | 43.7 | BOS |
| +024+ | 1.52 | Sad Sam Jones | 59 | BOS |
| +026+ | 1.44 | Rube Benton | 18 | SFN |
| +028+ | 1.36 | Hugh McQuillan | 52 | ATL |
| XXXXX | 1.19 | Rosy Ryan | 31.3 | SFN |
| XXXXX | 1.19 | Dolf Luque | 64 | CIN |
| XXXXX | 1.14 | Babe Adams | 36.3 | PIT |
| XXXXX | 1 | Red Oldham | 41.3 | DET |
| XXXXX | 0.92 | Waite Hoyt | 40.7 | NYA |
| XXXXX | 0.87 | Bill Pertica | 44.3 | SLN |
| XXXXX | 0.84 | George Uhle | 53.7 | CLE |
| XXXXX | 0.77 | Earl Hamilton | 53.3 | PIT |
| XXXXX | 0.58 | Roy Moore | 46.7 | OAK |
| XXXXX | 0.57 | Dana Fillingim | 31.7 | ATL |
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