| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 8.91 | 196306170_LAN_SFN |
| Whitey Ford | NYA | 5.35 | 196306180_TEX_NYA |
| Bob Friend | PIT | 4.96 | 196306180_PIT_ATL |
| Warren Spahn | ATL | 4.62 | 196306180_PIT_ATL |
| Juan Marichal | SFN | 1.98 | 196306190_LAN_SFN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jay Hook | NYN | -9.4 | 196306170_NYN_SLN |
| Ray Sadecki | SLN | -3.59 | 196306190_NYN_SLN |
| Ryne Duren | PHI | -0.97 | 196306170_PHI_CIN |
| Barry Latman | CLE | -0.86 | 196306180_BAL_CLE |
| Moe Drabowsky | OAK | -0.85 | 196306180_OAK_ANA |
Based on accumulated WAA for this season up to 1963-06-19.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 4.92 | Sandy Koufax | 116 | LAN |
| +005+ | 4.56 | Dick Ellsworth | 113 | CHN |
| +006+ | 4.43 | Jim O'Toole | 122 | CIN |
| +009+ | 3.47 | Larry Jackson | 120.3 | CHN |
| +010+ | 3.28 | Bob Friend | 116.7 | PIT |
| +011+ | 3.27 | John Buzhardt | 95.3 | CHA |
| +013+ | 3.03 | Juan Marichal | 125.3 | SFN |
| +017+ | 2.8 | Jim Bouton | 95.3 | NYA |
| +020+ | 2.7 | Jack Sanford | 129 | SFN |
| +021+ | 2.69 | Juan Pizarro | 98.7 | CHA |
| +024+ | 2.65 | Bob Buhl | 115.3 | CHN |
| +023+ | 2.65 | Denny Lemaster | 83.3 | ATL |
| +025+ | 2.58 | Ernie Broglio | 106.7 | SLN |
| +029+ | 2.31 | Earl Wilson | 105 | BOS |
| +033+ | 2.18 | Camilo Pascual | 105.7 | MIN |
| +034+ | 2.1 | Jack Kralick | 91.3 | TOT |
| +036+ | 2.09 | Bobby Bolin | 49 | SFN |
| +040+ | 2.05 | Steve Barber | 123 | BAL |
| +046+ | 1.84 | Ray Culp | 98.3 | PHI |
| +052+ | 1.78 | Ken McBride | 122.7 | ANA |
| +053+ | 1.77 | Don Schwall | 75.3 | PIT |
| +056+ | 1.72 | Billy O'Dell | 104 | SFN |
| +058+ | 1.67 | Turk Farrell | 85.3 | HOU |
| +061+ | 1.65 | Milt Pappas | 82 | BAL |
| +062+ | 1.64 | Don Drysdale | 138 | LAN |
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