| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dick Ellsworth | CHN | 8.28 | 196309150_CIN_CHN |
| Gary Peters | CHA | 6.9 | 196309140_CHA_TEX |
| Juan Marichal | SFN | 5.89 | 196309160_SFN_ATL |
| Don Drysdale | LAN | 2.33 | 196309150_LAN_PHI |
| Lee Stange | MIN | 1.1 | 196309150_NYA_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jay Hook | NYN | -4.56 | 196309152_HOU_NYN |
| Bill Stafford | NYA | -3.49 | 196309141_NYA_MIN |
| Ray Sadecki | SLN | -2.12 | 196309152_ATL_SLN |
| Jim Bunning | DET | -1.62 | 196309140_BAL_DET |
| Bo Belinsky | ANA | -1.59 | 196309150_CLE_ANA |
Based on accumulated WAA for this season up to 1963-09-16.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 10.24 | Sandy Koufax | 289.3 | LAN |
| +004+ | 8.14 | Dick Ellsworth | 272.7 | CHN |
| +007+ | 7.28 | Gary Peters | 224.7 | CHA |
| +008+ | 7.08 | Juan Marichal | 295 | SFN |
| +010+ | 6.96 | Bob Friend | 254 | PIT |
| +015+ | 6.31 | Larry Jackson | 260.3 | CHN |
| +018+ | 5.42 | Jim Bouton | 235.3 | NYA |
| +024+ | 4.93 | Curt Simmons | 219.3 | SLN |
| +026+ | 4.61 | Jim Maloney | 230 | CIN |
| +028+ | 4.58 | Don Drysdale | 294.7 | LAN |
| +027+ | 4.58 | Steve Barber | 247.7 | BAL |
| +029+ | 4.53 | Camilo Pascual | 221.3 | MIN |
| +031+ | 4.45 | Warren Spahn | 229 | ATL |
| +037+ | 4.08 | Joe Nuxhall | 198 | CIN |
| +039+ | 3.92 | Jim O'Toole | 229.3 | CIN |
| +041+ | 3.81 | Whitey Ford | 254.3 | NYA |
| +043+ | 3.72 | Al Downing | 154.7 | NYA |
| +047+ | 3.49 | Lee Stange | 151.7 | MIN |
| +048+ | 3.48 | Milt Pappas | 216 | BAL |
| +051+ | 3.43 | Ray Culp | 198.3 | PHI |
| +061+ | 3.09 | Ken Johnson | 205.7 | HOU |
| +063+ | 3.03 | Bob Veale | 60.7 | PIT |
| +072+ | 2.75 | Bob Sadowski | 105.3 | ATL |
| +079+ | 2.58 | Bob Shaw | 153 | ATL |
| +085+ | 2.49 | Carl Willey | 171 | NYN |
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