| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 10.81 | 196306250_LAN_CIN |
| Jim O'Toole | CIN | 9.2 | 196306250_LAN_CIN |
| Larry Jackson | CHN | 3.89 | 196306250_CHN_NYN |
| Juan Pizarro | CHA | 3.63 | 196306250_NYA_CHA |
| Warren Spahn | ATL | 2.87 | 196306230_SFN_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jay Hook | NYN | -11.12 | 196306250_CHN_NYN |
| Ray Sadecki | SLN | -4.01 | 196306250_SFN_SLN |
| Sam McDowell | CLE | -2.03 | 196306252_CLE_BOS |
| Art Mahaffey | PHI | -1.15 | 196306250_PHI_PIT |
| Chris Zachary | HOU | -0.76 | 196306232_HOU_CIN |
Based on accumulated WAA for this season up to 1963-06-25.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.44 | Sandy Koufax | 133.7 | LAN |
| +005+ | 4.62 | Larry Jackson | 138.3 | CHN |
| +006+ | 4.59 | Jim O'Toole | 138 | CIN |
| +007+ | 4.4 | Dick Ellsworth | 120 | CHN |
| +009+ | 3.95 | Bob Friend | 126 | PIT |
| +010+ | 3.9 | Juan Pizarro | 116.7 | CHA |
| +012+ | 3.83 | Denny Lemaster | 101.3 | ATL |
| +014+ | 3.51 | Jim Bouton | 104.3 | NYA |
| +018+ | 3.01 | John Buzhardt | 105.7 | CHA |
| +020+ | 2.91 | Juan Marichal | 132 | SFN |
| +026+ | 2.66 | Earl Wilson | 112.7 | BOS |
| +028+ | 2.54 | Ray Culp | 107.3 | PHI |
| +030+ | 2.44 | Ernie Broglio | 113.7 | SLN |
| +031+ | 2.42 | Billy O'Dell | 113 | SFN |
| +033+ | 2.33 | Steve Barber | 129.3 | BAL |
| +034+ | 2.26 | Jack Kralick | 99 | TOT |
| +036+ | 2.24 | Bobby Bolin | 53.7 | SFN |
| +039+ | 2.15 | Don Schwall | 80.7 | PIT |
| +045+ | 2.1 | Camilo Pascual | 105.7 | MIN |
| +046+ | 2.07 | Al McBean | 69.3 | PIT |
| +047+ | 2.06 | Carl Willey | 97 | NYN |
| +051+ | 1.99 | Bob Buhl | 121.3 | CHN |
| +053+ | 1.96 | Tom Cheney | 107.7 | TEX |
| +062+ | 1.78 | Jack Sanford | 133.7 | SFN |
| +068+ | 1.6 | Joe Nuxhall | 81 | CIN |
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