| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jack Chesbro | NYA | 5.36 | 190409030_DET_NYA |
| Frank Owen | CHA | 3.55 | 190409032_CHA_MIN |
| Eddie Plank | OAK | 2.9 | 190409032_BAL_OAK |
| Cy Young | BOS | 2.34 | 190409030_CLE_BOS |
| Harry Howell | BAL | 1.11 | 190409032_BAL_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Vic Willis | ATL | -4.01 | 190409030_ATL_SFN |
| Tully Sparks | PHI | -2.45 | 190409030_LAN_PHI |
| Oscar Jones | LAN | -1.9 | 190409020_LAN_PIT |
| Chappie McFarland | SLN | -1.43 | 190409040_SLN_CHN |
| Happy Townsend | MIN | -0.68 | 190409031_CHA_MIN |
Based on accumulated WAA for this season up to 1904-09-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 13.3 | Rube Waddell | 321.3 | OAK |
| +002+ | 11.68 | Jack Chesbro | 339.7 | NYA |
| +003+ | 10.93 | Joe McGinnity | 339.3 | SFN |
| +004+ | 9.68 | Frank Owen | 297 | CHA |
| +005+ | 8.54 | Eddie Plank | 295 | OAK |
| +007+ | 7.53 | Cy Young | 290.3 | BOS |
| +008+ | 6.65 | Jesse Tannehill | 238.7 | BOS |
| +009+ | 5.93 | Frank Smith | 158.3 | CHA |
| +010+ | 5.84 | Bill Dinneen | 233.7 | BOS |
| +011+ | 5.65 | Harry Howell | 232.7 | BAL |
| +013+ | 5.6 | Bill Bernhard | 252 | CLE |
| +016+ | 5.2 | Red Donahue | 215 | CLE |
| +019+ | 4.95 | Jack Powell | 293.7 | NYA |
| +020+ | 4.94 | Ed Killian | 283.7 | DET |
| +022+ | 4.7 | Kid Nichols | 247 | SLN |
| +025+ | 4.43 | Addie Joss | 133.3 | CLE |
| +026+ | 4.42 | Jake Weimer | 238.7 | CHN |
| +027+ | 4.39 | Fred Glade | 221.7 | BAL |
| +028+ | 4.21 | Bill Donovan | 242.3 | DET |
| +030+ | 4.11 | Norwood Gibson | 190 | BOS |
| +032+ | 4.04 | George Mullin | 297 | DET |
| +035+ | 3.8 | Doc White | 142 | CHA |
| +040+ | 3.15 | Weldon Henley | 222.7 | OAK |
| +046+ | 2.84 | Nick Altrock | 234 | CHA |
| +053+ | 2.4 | Otto Hess | 78.3 | CLE |
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