| Starter | Tm | Tier | Game |
|---|---|---|---|
| Stan Coveleski | CLE | 5.24 | 192106150_CLE_OAK |
| Fred Toney | SFN | 4.14 | 192106140_SFN_SLN |
| Wilbur Cooper | PIT | 3.3 | 192106150_LAN_PIT |
| Red Faber | CHA | 2.6 | 192106130_CHA_BOS |
| Dolf Luque | CIN | 2 | 192106150_PHI_CIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Hasty | OAK | -2.41 | 192106150_CLE_OAK |
| Eric Erickson | MIN | -2.33 | 192106130_CLE_MIN |
| Ray Caldwell | CLE | -2.25 | 192106130_CLE_MIN |
| Stan Baumgartner | PHI | -1.54 | 192106130_PHI_PIT |
| Dickey Kerr | CHA | -1 | 192106150_CHA_NYA |
Based on accumulated WAA for this season up to 1921-06-15.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +004+ | 5.35 | Red Faber | 130.3 | CHA |
| +006+ | 4.69 | George Mogridge | 94 | MIN |
| +010+ | 4.03 | Stan Coveleski | 133.7 | CLE |
| +011+ | 3.95 | Eppa Rixey | 108.3 | CIN |
| +014+ | 3.6 | Jesse Barnes | 96.7 | SFN |
| +015+ | 3.53 | Dolf Luque | 119 | CIN |
| +017+ | 3.15 | Burleigh Grimes | 86 | LAN |
| +018+ | 3.14 | Whitey Glazner | 83.7 | PIT |
| +019+ | 3 | Fred Toney | 97 | SFN |
| +020+ | 2.86 | Sad Sam Jones | 115.7 | BOS |
| +021+ | 2.77 | Earl Hamilton | 99.7 | PIT |
| +022+ | 2.72 | Rube Benton | 51.3 | SFN |
| +025+ | 2.61 | Herb Pennock | 73.7 | BOS |
| +031+ | 1.96 | Bill Pertica | 83 | SLN |
| +032+ | 1.94 | Jimmy Zinn | 55.7 | PIT |
| +034+ | 1.94 | Rube Marquard | 100.7 | CIN |
| +036+ | 1.91 | Dana Fillingim | 76.7 | ATL |
| +040+ | 1.83 | Wilbur Cooper | 103 | PIT |
| +045+ | 1.7 | Sherry Smith | 84 | LAN |
| +051+ | 1.61 | Red Causey | 41.7 | PHI |
| +056+ | 1.44 | Joe Oeschger | 98 | ATL |
| XXXXX | 1.23 | Hugh McQuillan | 98 | ATL |
| XXXXX | 1.22 | Bob Shawkey | 53.7 | NYA |
| XXXXX | 1.22 | Bill Doak | 52.3 | SLN |
| XXXXX | 1.11 | Jesse Haines | 91.3 | SLN |
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