| Starter | Tm | Tier | Game |
|---|---|---|---|
| Juan Marichal | SFN | 11.02 | 196607200_NYN_SFN |
| Jim Bunning | PHI | 5.65 | 196607190_PHI_HOU |
| Joe Horlen | CHA | 4.24 | 196607200_CHA_CLE |
| Jim Maloney | CIN | 3.93 | 196607190_CIN_CHN |
| Jim Kaat | MIN | 2.68 | 196607191_MIN_TEX |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sammy Ellis | CIN | -3.5 | 196607201_CIN_CHN |
| Ray Sadecki | SFN | -1.68 | 196607210_NYN_SFN |
| Tony Cloninger | ATL | -1.45 | 196607190_ATL_SLN |
| Bill Monbouquette | DET | -0.99 | 196607210_DET_BAL |
| Jack Fisher | NYN | -0.99 | 196607200_NYN_SFN |
Based on accumulated WAA for this season up to 1966-07-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 7.79 | Sandy Koufax | 182.3 | LAN |
| +004+ | 6.4 | Juan Marichal | 189.3 | SFN |
| +009+ | 5.22 | Bob Gibson | 163.3 | SLN |
| +011+ | 5.03 | Claude Osteen | 156.7 | LAN |
| +014+ | 4.35 | Mike Cuellar | 116.7 | HOU |
| +016+ | 3.85 | Al Jackson | 134.3 | SLN |
| +018+ | 3.84 | Joe Horlen | 126 | CHA |
| +019+ | 3.7 | Steve Barber | 122.7 | BAL |
| +023+ | 3.08 | Jim Maloney | 138.7 | CIN |
| +022+ | 3.08 | Jim Bunning | 165.7 | PHI |
| +024+ | 3.06 | Jim Kaat | 162.7 | MIN |
| +027+ | 2.89 | George Brunet | 126 | ANA |
| +029+ | 2.83 | Tommy John | 124 | CHA |
| +028+ | 2.83 | Gary Peters | 116.3 | CHA |
| +039+ | 2.61 | Bob Veale | 158 | PIT |
| +042+ | 2.54 | Woodie Fryman | 105.7 | PIT |
| +051+ | 2.28 | Dennis Ribant | 100.7 | NYN |
| +053+ | 2.25 | Sonny Siebert | 145.3 | CLE |
| +056+ | 2.24 | Gary Bell | 147.7 | CLE |
| +055+ | 2.24 | Sam McDowell | 101.7 | CLE |
| +059+ | 2.14 | Ray Washburn | 98.7 | SLN |
| +064+ | 2.04 | Gaylord Perry | 122 | SFN |
| +070+ | 1.99 | Ken Johnson | 131.7 | ATL |
| +071+ | 1.98 | Lew Krausse | 87.3 | OAK |
| +075+ | 1.69 | Larry Jackson | 130.7 | TOT |
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