| Starter | Tm | Tier | Game |
|---|---|---|---|
| Juan Marichal | SFN | 9.15 | 196609040_SFN_SLN |
| Jim Bunning | PHI | 8.23 | 196609060_PHI_CHN |
| Gary Peters | CHA | 6.93 | 196609040_BAL_CHA |
| Bob Gibson | SLN | 6.69 | 196609051_HOU_SLN |
| Jim Kaat | MIN | 3.08 | 196609040_NYA_MIN |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sammy Ellis | CIN | -5 | 196609040_LAN_CIN |
| Bob Bruce | HOU | -3.22 | 196609040_HOU_ATL |
| Dick Ellsworth | CHN | -2.7 | 196609052_PHI_CHN |
| Ray Culp | PHI | -2.47 | 196609052_PHI_CHN |
| Mickey Lolich | DET | -2.24 | 196609051_TEX_DET |
Based on accumulated WAA for this season up to 1966-09-06.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.56 | Sandy Koufax | 263 | LAN |
| +005+ | 8.57 | Juan Marichal | 254.7 | SFN |
| +007+ | 8.1 | Jim Bunning | 268 | PHI |
| +009+ | 7.57 | Bob Gibson | 241.3 | SLN |
| +010+ | 7.13 | Gary Peters | 202 | CHA |
| +013+ | 6.35 | Mike Cuellar | 184.7 | HOU |
| +019+ | 5.31 | Al Jackson | 209.3 | SLN |
| +021+ | 5.27 | Jim Kaat | 251.7 | MIN |
| +027+ | 4.8 | Tommy John | 196.7 | CHA |
| +033+ | 4.06 | Jim Maloney | 199.3 | CIN |
| +034+ | 4 | Claude Osteen | 207 | LAN |
| +035+ | 3.93 | Dennis Ribant | 175.7 | NYN |
| +039+ | 3.76 | Jim Perry | 151.7 | MIN |
| +040+ | 3.76 | Bruce Howard | 127.7 | CHA |
| +041+ | 3.64 | Sonny Siebert | 231 | CLE |
| +046+ | 3.34 | Jim Grant | 221.3 | MIN |
| +047+ | 3.33 | Gaylord Perry | 214 | SFN |
| +051+ | 3.07 | Joe Horlen | 173 | CHA |
| +054+ | 2.97 | Jim Nash | 97.7 | OAK |
| +057+ | 2.89 | Sam McDowell | 166.3 | CLE |
| +064+ | 2.67 | Steve Hargan | 146 | CLE |
| +066+ | 2.56 | Gary Bell | 230.7 | CLE |
| +070+ | 2.46 | Don Sutton | 213.7 | LAN |
| +071+ | 2.39 | George Brunet | 190.3 | ANA |
| +073+ | 2.38 | Dave McNally | 189 | BAL |
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