| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 9.56 | 196307030_SLN_LAN |
| Juan Marichal | SFN | 3.51 | 196307020_ATL_SFN |
| Warren Spahn | ATL | 3.16 | 196307020_ATL_SFN |
| Ralph Terry | NYA | 2.7 | 196307030_CHA_NYA |
| Dick Ellsworth | CHN | 2.36 | 196307030_NYN_CHN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Jay Hook | NYN | -9.51 | 196307030_NYN_CHN |
| Ray Sadecki | SLN | -4.25 | 196307010_SLN_HOU |
| Don Cardwell | PIT | -1.59 | 196307011_PIT_PHI |
| Bennie Daniels | TEX | -1.21 | 196307020_OAK_TEX |
| Paul Foytack | ANA | -0.96 | 196307020_ANA_BAL |
Based on accumulated WAA for this season up to 1963-07-03.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.41 | Sandy Koufax | 147.3 | LAN |
| +004+ | 4.84 | Jim O'Toole | 144 | CIN |
| +005+ | 4.83 | Dick Ellsworth | 140 | CHN |
| +007+ | 4.67 | Juan Marichal | 155.7 | SFN |
| +008+ | 4.63 | Bob Friend | 140 | PIT |
| +010+ | 4.42 | Larry Jackson | 145.3 | CHN |
| +015+ | 3.45 | Juan Pizarro | 124.3 | CHA |
| +019+ | 3.09 | Denny Lemaster | 112.7 | ATL |
| +022+ | 2.93 | Ray Culp | 123.3 | PHI |
| +023+ | 2.89 | Earl Wilson | 117.7 | BOS |
| +027+ | 2.82 | Steve Barber | 142.3 | BAL |
| +029+ | 2.77 | Ernie Broglio | 120.7 | SLN |
| +034+ | 2.47 | John Buzhardt | 117.3 | CHA |
| +036+ | 2.46 | Don Drysdale | 163 | LAN |
| +040+ | 2.35 | Bobby Bolin | 55.7 | SFN |
| +044+ | 2.32 | Camilo Pascual | 108.7 | MIN |
| +045+ | 2.31 | Jack Kralick | 105 | TOT |
| +047+ | 2.23 | Bob Buhl | 136.3 | CHN |
| +048+ | 2.22 | Carl Willey | 104.7 | NYN |
| +050+ | 2.13 | Don Schwall | 80.7 | PIT |
| +053+ | 2.11 | Joe Nuxhall | 90 | CIN |
| +055+ | 2.05 | Ken McBride | 145 | ANA |
| +056+ | 2.01 | Billy O'Dell | 125 | SFN |
| +061+ | 1.92 | Jim Bouton | 113.7 | NYA |
| +064+ | 1.9 | Gary Peters | 81.3 | CHA |
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