| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 13.34 | 196307161_LAN_PHI |
| Jim O'Toole | CIN | 7.15 | 196307170_SLN_CIN |
| Larry Jackson | CHN | 4.33 | 196307180_ATL_CHN |
| Juan Pizarro | CHA | 2.88 | 196307160_TEX_CHA |
| Camilo Pascual | MIN | 2.18 | 196307180_NYA_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ray Sadecki | SLN | -3.62 | 196307180_SLN_CIN |
| Paul Foytack | ANA | -1.87 | 196307172_CLE_ANA |
| Diego Segui | OAK | -1.03 | 196307170_BOS_OAK |
| Al Jackson | NYN | -0.99 | 196307160_HOU_NYN |
| Jerry Walker | CLE | -0.94 | 196307171_CLE_ANA |
Based on accumulated WAA for this season up to 1963-07-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.28 | Sandy Koufax | 174.3 | LAN |
| +002+ | 6.44 | Dick Ellsworth | 164.7 | CHN |
| +004+ | 5.98 | Bob Friend | 166.3 | PIT |
| +007+ | 5.34 | Jim O'Toole | 168 | CIN |
| +008+ | 5.21 | Juan Marichal | 180.3 | SFN |
| +009+ | 5.13 | Larry Jackson | 166.7 | CHN |
| +013+ | 3.99 | Juan Pizarro | 144 | CHA |
| +022+ | 3.34 | Denny Lemaster | 135.3 | ATL |
| +028+ | 2.97 | Ray Culp | 139.3 | PHI |
| +029+ | 2.95 | Don Schwall | 100.7 | PIT |
| +030+ | 2.9 | Jim Bouton | 135.7 | NYA |
| +033+ | 2.89 | John Buzhardt | 122.3 | CHA |
| +032+ | 2.89 | Ken McBride | 169.7 | ANA |
| +043+ | 2.66 | Gary Peters | 109 | CHA |
| +044+ | 2.57 | Joe Nuxhall | 111 | CIN |
| +046+ | 2.49 | Don Drysdale | 182.7 | LAN |
| +047+ | 2.45 | Warren Spahn | 148 | ATL |
| +051+ | 2.38 | Steve Barber | 149 | BAL |
| +052+ | 2.36 | Camilo Pascual | 114 | MIN |
| +055+ | 2.33 | Tom Cheney | 127.7 | TEX |
| +059+ | 2.21 | Carl Willey | 124.7 | NYN |
| +060+ | 2.2 | Bobby Bolin | 69.3 | SFN |
| +061+ | 2.18 | Bob Buhl | 153.3 | CHN |
| +064+ | 2.14 | Jack Kralick | 128.3 | TOT |
| +065+ | 2.11 | Ernie Broglio | 141.3 | SLN |
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