| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ray Sadecki | SLN | -3.23 | 196307281_SLN_CHN |
| Tracy Stallard | NYN | -2.82 | 196307300_NYN_LAN |
| Jerry Walker | CLE | -2.01 | 196307281_OAK_CLE |
| Dave Wickersham | OAK | -1.93 | 196307290_OAK_NYA |
| Paul Foytack | ANA | -1.78 | 196307282_ANA_BOS |
Based on accumulated WAA for this season up to 1963-07-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 7.15 | Sandy Koufax | 194.7 | LAN |
| +003+ | 7.15 | Dick Ellsworth | 188.7 | CHN |
| +004+ | 6.73 | Bob Friend | 187.3 | PIT |
| +005+ | 6.58 | Juan Marichal | 198.3 | SFN |
| +008+ | 5.7 | Larry Jackson | 183.7 | CHN |
| +010+ | 5.16 | Jim O'Toole | 172 | CIN |
| +011+ | 5.16 | Juan Pizarro | 159.7 | CHA |
| +016+ | 4.5 | Gary Peters | 136 | CHA |
| +017+ | 4.32 | Ken McBride | 193.7 | ANA |
| +018+ | 3.85 | Denny Lemaster | 159 | ATL |
| +026+ | 3.47 | Milt Pappas | 148.3 | BAL |
| +029+ | 3.31 | Camilo Pascual | 135.7 | MIN |
| +034+ | 3.09 | John Buzhardt | 126.3 | CHA |
| +035+ | 3.04 | Warren Spahn | 164.7 | ATL |
| +037+ | 3.03 | Jim Bouton | 160 | NYA |
| +038+ | 3.02 | Joe Nuxhall | 133.3 | CIN |
| +041+ | 2.83 | Steve Barber | 166.3 | BAL |
| +044+ | 2.69 | Don Drysdale | 207 | LAN |
| +050+ | 2.61 | Joe Gibbon | 88.3 | PIT |
| +052+ | 2.56 | Don Schwall | 113.3 | PIT |
| +053+ | 2.55 | Jim Maloney | 160.7 | CIN |
| +055+ | 2.51 | Tom Cheney | 128.7 | TEX |
| +062+ | 2.33 | Johnny Podres | 137.7 | LAN |
| +063+ | 2.32 | Bobby Bolin | 78 | SFN |
| +065+ | 2.26 | Ray Culp | 148.3 | PHI |
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