| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Friend | PIT | 8.73 | 196307190_CHN_PIT |
| Jim O'Toole | CIN | 7.15 | 196307170_SLN_CIN |
| Dick Ellsworth | CHN | 4.98 | 196307190_CHN_PIT |
| Don Drysdale | LAN | 2.73 | 196307190_LAN_ATL |
| Camilo Pascual | MIN | 2.18 | 196307180_NYA_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ray Sadecki | SLN | -3.62 | 196307180_SLN_CIN |
| Roger Craig | NYN | -2.03 | 196307190_NYN_PHI |
| Paul Foytack | ANA | -1.87 | 196307172_CLE_ANA |
| Diego Segui | OAK | -1.03 | 196307170_BOS_OAK |
| Jerry Walker | CLE | -0.94 | 196307171_CLE_ANA |
Based on accumulated WAA for this season up to 1963-07-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.29 | Sandy Koufax | 174.3 | LAN |
| +003+ | 6.11 | Dick Ellsworth | 170.7 | CHN |
| +004+ | 6 | Bob Friend | 174 | PIT |
| +007+ | 5.35 | Jim O'Toole | 168 | CIN |
| +008+ | 5.24 | Juan Marichal | 180.3 | SFN |
| +009+ | 5.16 | Larry Jackson | 166.7 | CHN |
| +013+ | 4 | Juan Pizarro | 144 | CHA |
| +020+ | 3.35 | Denny Lemaster | 135.3 | ATL |
| +028+ | 2.98 | Ray Culp | 139.3 | PHI |
| +029+ | 2.96 | Don Schwall | 100.7 | PIT |
| +031+ | 2.91 | Jim Bouton | 135.7 | NYA |
| +032+ | 2.9 | Ken McBride | 169.7 | ANA |
| +033+ | 2.89 | John Buzhardt | 122.3 | CHA |
| +036+ | 2.81 | Don Drysdale | 191.7 | LAN |
| +043+ | 2.66 | Gary Peters | 109 | CHA |
| +045+ | 2.57 | Steve Barber | 151 | BAL |
| +044+ | 2.57 | Joe Nuxhall | 111 | CIN |
| +049+ | 2.46 | Warren Spahn | 148 | ATL |
| +056+ | 2.32 | Camilo Pascual | 114 | MIN |
| +057+ | 2.29 | Tom Cheney | 127.7 | TEX |
| +060+ | 2.22 | Carl Willey | 124.7 | NYN |
| +061+ | 2.21 | Bobby Bolin | 69.3 | SFN |
| +062+ | 2.2 | Bob Buhl | 153.3 | CHN |
| +065+ | 2.14 | Jack Kralick | 128.3 | TOT |
| +067+ | 2.09 | Milt Pappas | 124.3 | BAL |
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