| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 8.91 | 196306170_LAN_SFN |
| Jim O'Toole | CIN | 8.12 | 196306162_NYN_CIN |
| Whitey Ford | NYA | 5.35 | 196306180_TEX_NYA |
| Bob Friend | PIT | 4.96 | 196306180_PIT_ATL |
| Warren Spahn | ATL | 4.62 | 196306180_PIT_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jay Hook | NYN | -9.4 | 196306170_NYN_SLN |
| Don Rudolph | TEX | -1.64 | 196306162_TEX_CLE |
| 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 1963-06-18.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 4.87 | Sandy Koufax | 116 | LAN |
| +004+ | 4.53 | Dick Ellsworth | 113 | CHN |
| +005+ | 4.42 | Jim O'Toole | 122 | CIN |
| +009+ | 3.44 | Larry Jackson | 120.3 | CHN |
| +010+ | 3.25 | Bob Friend | 116.7 | PIT |
| +011+ | 3.24 | John Buzhardt | 95.3 | CHA |
| +017+ | 2.67 | Juan Pizarro | 98.7 | CHA |
| +018+ | 2.67 | Jack Sanford | 129 | SFN |
| +019+ | 2.63 | Denny Lemaster | 83.3 | ATL |
| +020+ | 2.62 | Bob Buhl | 115.3 | CHN |
| +021+ | 2.59 | Juan Marichal | 117.7 | SFN |
| +024+ | 2.55 | Ernie Broglio | 106.7 | SLN |
| +026+ | 2.52 | Jim Bouton | 87 | NYA |
| +028+ | 2.29 | Earl Wilson | 105 | BOS |
| +032+ | 2.16 | Camilo Pascual | 105.7 | MIN |
| +034+ | 2.09 | Don Drysdale | 133.7 | LAN |
| +036+ | 2.08 | Bobby Bolin | 49 | SFN |
| +035+ | 2.08 | Jack Kralick | 91.3 | TOT |
| +041+ | 1.95 | Steve Barber | 117 | BAL |
| +046+ | 1.83 | Ray Culp | 98.3 | PHI |
| +051+ | 1.76 | Don Schwall | 75.3 | PIT |
| +053+ | 1.74 | Ken McBride | 122.7 | ANA |
| +055+ | 1.7 | Billy O'Dell | 104 | SFN |
| +059+ | 1.64 | Turk Farrell | 85.3 | HOU |
| +060+ | 1.63 | Dallas Green | 40 | PHI |
_