| Starter | Tm | Tier | Game |
|---|---|---|---|
| Stan Coveleski | CLE | 4.76 | 192106230_CLE_CHA |
| Fred Toney | SFN | 3.9 | 192106230_ATL_SFN |
| Red Faber | CHA | 3.78 | 192106220_CLE_CHA |
| Pete Alexander | CHN | 3.16 | 192106212_CHN_SLN |
| Wilbur Cooper | PIT | 3.02 | 192106220_PIT_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rollie Naylor | OAK | -1.67 | 192106210_MIN_OAK |
| Hooks Dauss | DET | -1.08 | 192106230_BAL_DET |
| Rip Collins | NYA | -1.02 | 192106230_NYA_BOS |
| Doug McWeeny | CHA | -1.01 | 192106210_CLE_CHA |
| Al Schacht | MIN | -0.95 | 192106230_MIN_OAK |
Based on accumulated WAA for this season up to 1921-06-23.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.82 | Red Faber | 148.3 | CHA |
| +007+ | 4.7 | George Mogridge | 113 | MIN |
| +008+ | 4.59 | Eppa Rixey | 120.3 | CIN |
| +009+ | 4.55 | Jesse Barnes | 109.7 | SFN |
| +012+ | 3.88 | Burleigh Grimes | 97 | LAN |
| +014+ | 3.24 | Dolf Luque | 128 | CIN |
| +018+ | 2.98 | Stan Coveleski | 144.3 | CLE |
| +019+ | 2.93 | Herb Pennock | 92.7 | BOS |
| +020+ | 2.92 | Whitey Glazner | 94.7 | PIT |
| +021+ | 2.79 | Bill Piercy | 63.3 | NYA |
| +023+ | 2.71 | Wilbur Cooper | 124 | PIT |
| +024+ | 2.58 | Earl Hamilton | 113.7 | PIT |
| +027+ | 2.5 | Dana Fillingim | 94.7 | ATL |
| +028+ | 2.47 | Fred Toney | 107.7 | SFN |
| +030+ | 2.37 | Sad Sam Jones | 131.3 | BOS |
| +033+ | 2.19 | Rube Benton | 59.3 | SFN |
| +040+ | 1.8 | Red Causey | 49.7 | PHI |
| +047+ | 1.7 | Bill Doak | 69.3 | SLN |
| +051+ | 1.56 | Jimmy Zinn | 59.7 | PIT |
| +056+ | 1.52 | Rube Marquard | 114.7 | CIN |
| +059+ | 1.45 | Allen Russell | 73.7 | BOS |
| +060+ | 1.41 | George Uhle | 123.7 | CLE |
| +062+ | 1.4 | Hugh McQuillan | 114 | ATL |
| +063+ | 1.36 | Bill Pertica | 94 | SLN |
| +064+ | 1.34 | Elam Vangilder | 37.3 | BAL |
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