| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 13.61 | 196309210_PIT_LAN |
| Dick Ellsworth | CHN | 7.52 | 196309200_ATL_CHN |
| Juan Marichal | SFN | 5.87 | 196309200_NYN_SFN |
| Bob Friend | PIT | 5.47 | 196309210_PIT_LAN |
| Jim Bouton | NYA | 3.35 | 196309202_OAK_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bo Belinsky | ANA | -1.93 | 196309190_BAL_ANA |
| Ray Sadecki | SLN | -1.59 | 196309200_SLN_CIN |
| Gene Conley | BOS | -1.35 | 196309212_MIN_BOS |
| Al Jackson | NYN | -1.33 | 196309210_NYN_SFN |
| Jim Bunning | DET | -1.06 | 196309190_DET_MIN |
Based on accumulated WAA for this season up to 1963-09-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 10.88 | Sandy Koufax | 306 | LAN |
| +004+ | 8.89 | Dick Ellsworth | 281.7 | CHN |
| +007+ | 7.6 | Gary Peters | 233.7 | CHA |
| +009+ | 7.41 | Juan Marichal | 304 | SFN |
| +013+ | 7.1 | Bob Friend | 268.3 | PIT |
| +016+ | 6.21 | Larry Jackson | 269.3 | CHN |
| +020+ | 5.26 | Don Drysdale | 304 | LAN |
| +022+ | 5.22 | Camilo Pascual | 230.3 | MIN |
| +023+ | 5.1 | Jim Bouton | 242.3 | NYA |
| +026+ | 4.96 | Steve Barber | 254.7 | BAL |
| +027+ | 4.91 | Curt Simmons | 227.3 | SLN |
| +030+ | 4.59 | Warren Spahn | 241 | ATL |
| +034+ | 4.17 | Whitey Ford | 259.3 | NYA |
| +037+ | 3.92 | Jim O'Toole | 229.3 | CIN |
| +038+ | 3.9 | Jim Maloney | 236.7 | CIN |
| +042+ | 3.83 | Al Downing | 161.7 | NYA |
| +043+ | 3.83 | Ken Johnson | 214.7 | HOU |
| +044+ | 3.77 | Joe Nuxhall | 199.3 | CIN |
| +061+ | 3.09 | Lee Stange | 157.3 | MIN |
| +062+ | 3.04 | Bob Veale | 60.7 | PIT |
| +064+ | 3.01 | Ray Culp | 203.3 | PHI |
| +076+ | 2.69 | Bob Sadowski | 112.3 | ATL |
| +077+ | 2.61 | Denny Lemaster | 226.7 | ATL |
| +079+ | 2.54 | Bob Shaw | 155 | ATL |
| +084+ | 2.47 | Milt Pappas | 216.3 | BAL |
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