| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sandy Koufax | LAN | 16.86 | 196609030_LAN_CIN |
| Juan Marichal | SFN | 9.15 | 196609040_SFN_SLN |
| Jim Bunning | PHI | 7.24 | 196609020_PHI_NYN |
| Gary Peters | CHA | 6.93 | 196609040_BAL_CHA |
| Mike Cuellar | HOU | 3.8 | 196609032_HOU_ATL |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sammy Ellis | CIN | -5 | 196609040_LAN_CIN |
| Bob Bruce | HOU | -3.22 | 196609040_HOU_ATL |
| Fred Talbot | NYA | -1.99 | 196609031_NYA_MIN |
| Bill Hands | CHN | -1.71 | 196609040_CHN_PIT |
| Jim Lonborg | BOS | -1.36 | 196609030_BOS_OAK |
Based on accumulated WAA for this season up to 1966-09-04.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 10.55 | Sandy Koufax | 263 | LAN |
| +004+ | 8.54 | Juan Marichal | 254.7 | SFN |
| +007+ | 8.12 | Jim Bunning | 261 | PHI |
| +009+ | 7.16 | Gary Peters | 202 | CHA |
| +010+ | 7.02 | Bob Gibson | 232.3 | SLN |
| +013+ | 6.33 | Mike Cuellar | 184.7 | HOU |
| +018+ | 5.32 | Jim Kaat | 251.7 | MIN |
| +022+ | 4.98 | Al Jackson | 205.3 | SLN |
| +027+ | 4.59 | Tommy John | 188.7 | CHA |
| +031+ | 4.19 | Jim Maloney | 193.3 | CIN |
| +035+ | 4 | Claude Osteen | 207 | LAN |
| +036+ | 3.9 | Bruce Howard | 119 | CHA |
| +038+ | 3.8 | Jim Perry | 151.7 | MIN |
| +040+ | 3.6 | Dennis Ribant | 166.7 | NYN |
| +045+ | 3.26 | Steve Hargan | 143 | CLE |
| +048+ | 3.13 | Jim Grant | 213.3 | MIN |
| +049+ | 3.1 | Sonny Siebert | 222 | CLE |
| +051+ | 3.07 | Joe Horlen | 172.7 | CHA |
| +053+ | 3.03 | Gaylord Perry | 208 | SFN |
| +058+ | 2.88 | Sam McDowell | 166.3 | CLE |
| +066+ | 2.47 | Don Sutton | 211.3 | LAN |
| +068+ | 2.45 | Bob Veale | 213.7 | PIT |
| +069+ | 2.43 | Jim Nash | 88.7 | OAK |
| +072+ | 2.37 | George Brunet | 190.3 | ANA |
| +077+ | 2.23 | Gary Bell | 221.7 | CLE |
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