| Starter | Tm | Tier | Game |
|---|---|---|---|
| Bob Gibson | SLN | 6.91 | 196608071_SLN_NYN |
| Joe Horlen | CHA | 4.93 | 196608070_CHA_ANA |
| Claude Osteen | LAN | 4.54 | 196608070_LAN_HOU |
| Jim Maloney | CIN | 4.32 | 196608081_SFN_CIN |
| Bob Veale | PIT | 3.43 | 196608070_CIN_PIT |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sammy Ellis | CIN | -2.77 | 196608082_SFN_CIN |
| Ray Sadecki | SFN | -2.23 | 196608081_SFN_CIN |
| Tony Cloninger | ATL | -2.03 | 196608070_ATL_PHI |
| Jim Lonborg | BOS | -1.86 | 196608071_BOS_DET |
| Bill Monbouquette | DET | -1.41 | 196608071_BOS_DET |
Based on accumulated WAA for this season up to 1966-08-08.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 9.93 | Sandy Koufax | 215.3 | LAN |
| +003+ | 7.34 | Juan Marichal | 207.7 | SFN |
| +006+ | 6.43 | Bob Gibson | 194.7 | SLN |
| +011+ | 5.56 | Jim Bunning | 203.3 | PHI |
| +016+ | 4.87 | Al Jackson | 166 | SLN |
| +018+ | 4.51 | Gary Peters | 142.3 | CHA |
| +020+ | 4.45 | Claude Osteen | 177.7 | LAN |
| +021+ | 4.39 | Joe Horlen | 146 | CHA |
| +022+ | 4.06 | Tommy John | 147 | CHA |
| +023+ | 3.89 | Mike Cuellar | 136.7 | HOU |
| +025+ | 3.56 | Steve Barber | 123.7 | BAL |
| +029+ | 3.38 | Jim Maloney | 169.7 | CIN |
| +043+ | 2.78 | Bruce Howard | 96.3 | CHA |
| +044+ | 2.71 | Jim Kaat | 191.3 | MIN |
| +047+ | 2.63 | Bob Veale | 171 | PIT |
| +049+ | 2.57 | Dave McNally | 147.7 | BAL |
| +051+ | 2.55 | Gaylord Perry | 162 | SFN |
| +050+ | 2.55 | George Brunet | 148 | ANA |
| +054+ | 2.5 | Dave Boswell | 157 | MIN |
| +055+ | 2.48 | Gary Bell | 183.7 | CLE |
| +057+ | 2.41 | Dennis Ribant | 123.3 | NYN |
| +068+ | 2.11 | Jim Grant | 164.7 | MIN |
| +069+ | 2.1 | Sonny Siebert | 176.7 | CLE |
| +070+ | 2.1 | Pete Richert | 189.7 | TEX |
| +075+ | 1.93 | Ken Johnson | 160 | ATL |
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