| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 12.18 | 196309170_LAN_SLN |
| Gary Peters | CHA | 6.22 | 196309182_BOS_CHA |
| Bob Friend | PIT | 5.74 | 196309171_CHN_PIT |
| Curt Simmons | SLN | 2.5 | 196309170_LAN_SLN |
| Steve Barber | BAL | 2.39 | 196309181_BAL_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Dave Wickersham | OAK | -2.31 | 196309180_OAK_TEX |
| Bo Belinsky | ANA | -1.93 | 196309190_BAL_ANA |
| Tracy Stallard | NYN | -1.93 | 196309170_PHI_NYN |
| Bennie Daniels | TEX | -1.65 | 196309170_OAK_TEX |
| Dick Drott | HOU | -1.09 | 196309180_HOU_CIN |
Based on accumulated WAA for this season up to 1963-09-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 10.93 | Sandy Koufax | 298.3 | LAN |
| +004+ | 8.19 | Dick Ellsworth | 272.7 | CHN |
| +007+ | 7.61 | Gary Peters | 233.7 | CHA |
| +009+ | 7.13 | Juan Marichal | 295 | SFN |
| +012+ | 7.01 | Bob Friend | 262 | PIT |
| +016+ | 6.35 | Larry Jackson | 260.3 | CHN |
| +019+ | 5.45 | Jim Bouton | 235.3 | NYA |
| +022+ | 5.23 | Camilo Pascual | 230.3 | MIN |
| +024+ | 4.98 | Steve Barber | 254.7 | BAL |
| +026+ | 4.92 | Curt Simmons | 227.3 | SLN |
| +029+ | 4.55 | Don Drysdale | 294.7 | LAN |
| +035+ | 3.95 | Jim O'Toole | 229.3 | CIN |
| +036+ | 3.92 | Jim Maloney | 236.7 | CIN |
| +038+ | 3.88 | Al Downing | 161.7 | NYA |
| +037+ | 3.88 | Warren Spahn | 232 | ATL |
| +040+ | 3.84 | Whitey Ford | 254.3 | NYA |
| +045+ | 3.79 | Joe Nuxhall | 199.3 | CIN |
| +051+ | 3.52 | Milt Pappas | 216 | BAL |
| +053+ | 3.47 | Lee Stange | 151.7 | MIN |
| +060+ | 3.12 | Ken Johnson | 205.7 | HOU |
| +063+ | 3.04 | Bob Veale | 60.7 | PIT |
| +064+ | 3.02 | Ray Culp | 203.3 | PHI |
| +075+ | 2.7 | Bob Sadowski | 112.3 | ATL |
| +081+ | 2.55 | Bob Shaw | 155 | ATL |
| +082+ | 2.51 | Carl Willey | 171 | NYN |
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