| Starter | Tm | Tier | Game |
|---|---|---|---|
| Rube Waddell | OAK | 13.27 | 190405302_OAK_NYA |
| Joe McGinnity | SFN | 10.5 | 190405310_SFN_PHI |
| Cy Young | BOS | 8.58 | 190406010_BOS_CLE |
| Bill Donovan | DET | 1.55 | 190406010_NYA_DET |
| Jack Chesbro | NYA | 0.78 | 190406010_NYA_DET |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Johnny Lush | PHI | -3.62 | 190405301_SFN_PHI |
| Jack Harper | CIN | -1.84 | 190405301_CHN_CIN |
| Davey Dunkle | MIN | -0.58 | 190405302_MIN_BOS |
| Bill Reidy | LAN | -0.52 | 190405302_ATL_LAN |
| Kaiser Wilhelm | ATL | -0.28 | 190405310_ATL_LAN |
Based on accumulated WAA for this season up to 1904-06-01.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 6.39 | Rube Waddell | 112 | OAK |
| +002+ | 5.73 | Joe McGinnity | 115 | SFN |
| +003+ | 4.24 | Cy Young | 92 | BOS |
| +004+ | 4.01 | Jesse Tannehill | 78.7 | BOS |
| +005+ | 3.94 | Red Donahue | 71 | CLE |
| +006+ | 3.71 | Jack Chesbro | 119 | NYA |
| +007+ | 3.42 | Frank Owen | 89 | CHA |
| +008+ | 3.24 | Bill Dinneen | 77 | BOS |
| +014+ | 2.45 | Norwood Gibson | 54 | BOS |
| +018+ | 2.28 | Ed Killian | 96.3 | DET |
| +019+ | 2.19 | Eddie Plank | 104 | OAK |
| +022+ | 1.89 | Harry Howell | 72.7 | BAL |
| +023+ | 1.64 | Jake Weimer | 78.3 | CHN |
| +031+ | 1.38 | Weldon Henley | 83.3 | OAK |
| +033+ | 1.37 | Fred Glade | 54.7 | BAL |
| +035+ | 1.3 | Ed Siever | 76 | BAL |
| XXXXX | 1.22 | Bill Bernhard | 86 | CLE |
| XXXXX | 1.18 | Casey Patten | 86.7 | MIN |
| XXXXX | 1.12 | Nick Altrock | 71 | CHA |
| XXXXX | 1.02 | George Mullin | 111 | DET |
| XXXXX | 1 | Chappie McFarland | 61 | SLN |
| XXXXX | 0.88 | Barney Pelty | 59.3 | BAL |
| XXXXX | 0.86 | Jack Cronin | 98.7 | LAN |
| XXXXX | 0.8 | Earl Moore | 44 | CLE |
| XXXXX | 0.73 | Claude Elliott | 43 | CIN |
_