| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ray Sadecki | SLN | -2.53 | 196309110_CHN_SLN |
| Dick Donovan | CLE | -1.95 | 196309110_CLE_MIN |
| Tracy Stallard | NYN | -1.82 | 196309120_SFN_NYN |
| Dave Wickersham | OAK | -1.77 | 196309130_BOS_OAK |
| Bennie Daniels | TEX | -1.43 | 196309110_DET_TEX |
Based on accumulated WAA for this season up to 1963-09-13.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 10.3 | Sandy Koufax | 289.3 | LAN |
| +003+ | 8.33 | Dick Ellsworth | 266.3 | CHN |
| +005+ | 7.73 | Gary Peters | 221.7 | CHA |
| +008+ | 7.07 | Juan Marichal | 286 | SFN |
| +009+ | 7.04 | Bob Friend | 254 | PIT |
| +016+ | 5.7 | Larry Jackson | 252 | CHN |
| +017+ | 5.48 | Jim Bouton | 235.3 | NYA |
| +024+ | 4.99 | Curt Simmons | 219.3 | SLN |
| +026+ | 4.68 | Jim Maloney | 230 | CIN |
| +027+ | 4.66 | Steve Barber | 247.7 | BAL |
| +028+ | 4.59 | Camilo Pascual | 221.3 | MIN |
| +029+ | 4.5 | Don Drysdale | 287.7 | LAN |
| +030+ | 4.47 | Warren Spahn | 229 | ATL |
| +035+ | 4.14 | Joe Nuxhall | 198 | CIN |
| +038+ | 3.99 | Jim O'Toole | 229.3 | CIN |
| +042+ | 3.75 | Al Downing | 154.7 | NYA |
| +048+ | 3.49 | Ray Culp | 198.3 | PHI |
| +051+ | 3.35 | Whitey Ford | 245.3 | NYA |
| +052+ | 3.3 | Lee Stange | 143.7 | MIN |
| +055+ | 3.19 | Milt Pappas | 209 | BAL |
| +078+ | 2.54 | Denny Lemaster | 215.3 | ATL |
| +083+ | 2.49 | Bob Sadowski | 99.3 | ATL |
| +084+ | 2.41 | Ken Johnson | 196.7 | HOU |
| +086+ | 2.39 | Carl Willey | 164 | NYN |
| +087+ | 2.32 | Bob Veale | 51.7 | PIT |
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