| Starter | Tm | Tier | Game |
|---|---|---|---|
| Carl Mays | NYA | 8.22 | 192106200_NYA_BOS |
| Stan Coveleski | CLE | 5.21 | 192106190_DET_CLE |
| Jesse Barnes | SFN | 5.13 | 192106190_SFN_CHN |
| Pete Alexander | CHN | 3.16 | 192106212_CHN_SLN |
| Dolf Luque | CIN | 2.57 | 192106190_PHI_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Hasty | OAK | -2.24 | 192106202_MIN_OAK |
| Stan Baumgartner | PHI | -1.76 | 192106190_PHI_CIN |
| Dutch Leonard | DET | -1.74 | 192106190_DET_CLE |
| Doug McWeeny | CHA | -1.01 | 192106210_CLE_CHA |
| Harry Courtney | MIN | -0.87 | 192106202_MIN_OAK |
Based on accumulated WAA for this season up to 1921-06-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +003+ | 5.67 | Red Faber | 139.3 | CHA |
| +004+ | 5.59 | Carl Mays | 134.7 | NYA |
| +006+ | 4.79 | George Mogridge | 113 | MIN |
| +007+ | 4.62 | Jesse Barnes | 109.7 | SFN |
| +011+ | 3.98 | Eppa Rixey | 108.3 | CIN |
| +012+ | 3.94 | Burleigh Grimes | 97 | LAN |
| +013+ | 3.66 | Stan Coveleski | 137.7 | CLE |
| +015+ | 3.4 | Dolf Luque | 128 | CIN |
| +018+ | 3.04 | Whitey Glazner | 94.7 | PIT |
| +019+ | 3 | Herb Pennock | 92.7 | BOS |
| +021+ | 2.88 | Bill Piercy | 55.3 | NYA |
| +022+ | 2.86 | Sad Sam Jones | 124.7 | BOS |
| +023+ | 2.72 | Dana Fillingim | 85.7 | ATL |
| +025+ | 2.5 | Fred Toney | 98.7 | SFN |
| +028+ | 2.3 | Earl Hamilton | 104.7 | PIT |
| +031+ | 2.23 | Rube Benton | 59.3 | SFN |
| +032+ | 2.15 | Wilbur Cooper | 112 | PIT |
| +034+ | 2.07 | Jimmy Zinn | 57.7 | PIT |
| +056+ | 1.53 | Bill Doak | 60.3 | SLN |
| +058+ | 1.5 | Rube Marquard | 106.7 | CIN |
| +059+ | 1.48 | Bill Pertica | 94 | SLN |
| +060+ | 1.46 | George Uhle | 123.7 | CLE |
| +061+ | 1.44 | Hugh McQuillan | 114 | ATL |
| +062+ | 1.36 | Sherry Smith | 92 | LAN |
| +063+ | 1.33 | Phil Douglas | 63 | SFN |
_