| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 10.38 | 196309060_LAN_SFN |
| Dick Ellsworth | CHN | 8.17 | 196309070_CHN_HOU |
| Bob Friend | PIT | 7.49 | 196309080_SLN_PIT |
| Juan Marichal | SFN | 4.24 | 196309070_LAN_SFN |
| Warren Spahn | ATL | 3.03 | 196309080_ATL_PHI |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jay Hook | NYN | -4.86 | 196309080_NYN_CIN |
| Jim Duckworth | TEX | -4.46 | 196309080_CLE_TEX |
| Ray Sadecki | SLN | -2.36 | 196309070_SLN_PIT |
| Dave Wickersham | OAK | -2 | 196309060_OAK_ANA |
| Dick Donovan | CLE | -1.79 | 196309060_CLE_TEX |
Based on accumulated WAA for this season up to 1963-09-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 9.41 | Sandy Koufax | 273.3 | LAN |
| +003+ | 8.44 | Dick Ellsworth | 258.3 | CHN |
| +004+ | 8 | Gary Peters | 214.7 | CHA |
| +005+ | 7.82 | Bob Friend | 250 | PIT |
| +011+ | 6.35 | Juan Marichal | 277 | SFN |
| +013+ | 6.09 | Larry Jackson | 247.3 | CHN |
| +017+ | 5.35 | Warren Spahn | 227.7 | ATL |
| +018+ | 5.3 | Juan Pizarro | 215 | CHA |
| +023+ | 4.78 | Jim O'Toole | 226.3 | CIN |
| +026+ | 4.65 | Jim Bouton | 220.3 | NYA |
| +027+ | 4.57 | Steve Barber | 239.3 | BAL |
| +030+ | 4.45 | Don Drysdale | 284.7 | LAN |
| +031+ | 4.36 | Camilo Pascual | 213.3 | MIN |
| +032+ | 4.35 | Jim Maloney | 221 | CIN |
| +034+ | 4.1 | Joe Nuxhall | 190 | CIN |
| +040+ | 3.73 | Al Downing | 154.7 | NYA |
| +043+ | 3.52 | Curt Simmons | 201.3 | SLN |
| +053+ | 3.2 | Lee Stange | 134.7 | MIN |
| +054+ | 3.11 | Bob Veale | 48.3 | PIT |
| +057+ | 3.05 | Denny Lemaster | 212 | ATL |
| +062+ | 2.96 | Ray Culp | 189.3 | PHI |
| +064+ | 2.8 | Whitey Ford | 236.3 | NYA |
| +066+ | 2.74 | Tom Cheney | 136.7 | TEX |
| +072+ | 2.66 | Milt Pappas | 203 | BAL |
| +076+ | 2.54 | Bob Shaw | 142.3 | ATL |
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