| Starter | Tm | Tier | Game |
|---|---|---|---|
| Joe McGinnity | SFN | 10.29 | 190406210_SFN_ATL |
| Jack Taylor | SLN | 2.53 | 190406191_PIT_SLN |
| Jack Chesbro | NYA | 2.39 | 190406210_NYA_MIN |
| Red Donahue | CLE | 2.19 | 190406210_CLE_CHA |
| Sam Leever | PIT | 2.14 | 190406191_PIT_SLN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bill Duggleby | PHI | -2.01 | 190406201_PHI_ATL |
| Joe Corbett | SLN | -1.71 | 190406210_PIT_SLN |
| Bill Reidy | LAN | -1.31 | 190406200_LAN_SFN |
| Jack Harper | CIN | -1.14 | 190406200_CHN_CIN |
| Pat Carney | ATL | -0.94 | 190406201_PHI_ATL |
Based on accumulated WAA for this season up to 1904-06-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.77 | Rube Waddell | 150 | OAK |
| +002+ | 7.71 | Joe McGinnity | 174 | SFN |
| +003+ | 6.16 | Jack Chesbro | 164 | NYA |
| +004+ | 5.93 | Red Donahue | 108.3 | CLE |
| +005+ | 5.38 | Cy Young | 118 | BOS |
| +006+ | 5.07 | Frank Owen | 136.7 | CHA |
| +007+ | 4.83 | Jesse Tannehill | 113.7 | BOS |
| +008+ | 3.86 | Bill Dinneen | 122.7 | BOS |
| +015+ | 2.89 | Harry Howell | 106.7 | BAL |
| +016+ | 2.85 | Eddie Plank | 136 | OAK |
| +019+ | 2.52 | Weldon Henley | 108.7 | OAK |
| +020+ | 2.5 | Bill Bernhard | 115 | CLE |
| +021+ | 2.39 | Ed Killian | 136.3 | DET |
| +024+ | 2.22 | Barney Pelty | 86.3 | BAL |
| +025+ | 2.19 | George Mullin | 157 | DET |
| +027+ | 2.12 | Patsy Flaherty | 78 | TOT |
| +028+ | 2.11 | Jack Taylor | 119 | SLN |
| +030+ | 2.03 | Fred Glade | 86.7 | BAL |
| +032+ | 1.8 | Jack Powell | 120.7 | NYA |
| +034+ | 1.74 | Ed Siever | 94 | BAL |
| +038+ | 1.68 | Sam Leever | 97 | PIT |
| +045+ | 1.36 | Nick Altrock | 111.3 | CHA |
| +048+ | 1.31 | Norwood Gibson | 72 | BOS |
| +050+ | 1.26 | George Winter | 42.3 | BOS |
| XXXXX | 1.23 | Bill Donovan | 120 | DET |
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