| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Gibson | SLN | 8 | 196607280_SLN_ATL |
| Jim Maloney | CIN | 3.56 | 196607290_HOU_CIN |
| Mel Stottlemyre | NYA | 2.14 | 196607300_NYA_CHA |
| Gary Peters | CHA | 2.04 | 196607300_NYA_CHA |
| Sonny Siebert | CLE | 1.78 | 196607290_CLE_ANA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sammy Ellis | CIN | -3.88 | 196607300_HOU_CIN |
| Dick Ellsworth | CHN | -2.55 | 196607300_CHN_NYN |
| Tony Cloninger | ATL | -1.42 | 196607290_SFN_ATL |
| Phil Ortega | TEX | -1.22 | 196607292_BOS_TEX |
| Mickey Lolich | DET | -0.85 | 196607300_DET_OAK |
Based on accumulated WAA for this season up to 1966-07-30.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 9.06 | Sandy Koufax | 202.3 | LAN |
| +003+ | 7.01 | Juan Marichal | 198.3 | SFN |
| +007+ | 5.97 | Bob Gibson | 179.3 | SLN |
| +010+ | 5.17 | Claude Osteen | 170.7 | LAN |
| +015+ | 4.62 | Jim Bunning | 185.7 | PHI |
| +016+ | 4.41 | Al Jackson | 150.7 | SLN |
| +017+ | 3.98 | Joe Horlen | 132 | CHA |
| +020+ | 3.67 | Gary Peters | 133.3 | CHA |
| +021+ | 3.64 | Mike Cuellar | 127.7 | HOU |
| +022+ | 3.43 | Steve Barber | 123.7 | BAL |
| +029+ | 3.1 | Jim Maloney | 154 | CIN |
| +035+ | 2.85 | Dennis Ribant | 117 | NYN |
| +039+ | 2.71 | George Brunet | 138 | ANA |
| +040+ | 2.71 | Bob Veale | 158 | PIT |
| +042+ | 2.7 | Sonny Siebert | 162.7 | CLE |
| +051+ | 2.47 | Tommy John | 129 | CHA |
| +052+ | 2.46 | Jim Kaat | 172.7 | MIN |
| +054+ | 2.44 | Bruce Howard | 88 | CHA |
| +058+ | 2.25 | Woodie Fryman | 116.7 | PIT |
| +059+ | 2.23 | Gaylord Perry | 147 | SFN |
| +065+ | 2.17 | Sam McDowell | 102.7 | CLE |
| +068+ | 2.11 | Dave McNally | 133.3 | BAL |
| +074+ | 1.91 | Larry Jackson | 152.7 | TOT |
| +076+ | 1.87 | Jim O'Toole | 83.3 | CIN |
| +077+ | 1.86 | Gary Bell | 167.7 | CLE |
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