| Starter | Tm | Tier | Game |
|---|---|---|---|
| Juan Marichal | SFN | 11.54 | 196606210_SFN_CHN |
| Jim Bunning | PHI | 9.23 | 196606191_PHI_SLN |
| Bob Gibson | SLN | 7 | 196606192_PHI_SLN |
| Mel Stottlemyre | NYA | 5.77 | 196606211_BAL_NYA |
| Joe Horlen | CHA | 3.54 | 196606200_CHA_OAK |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Sammy Ellis | CIN | -2.52 | 196606192_NYN_CIN |
| Diego Segui | TEX | -2.38 | 196606210_DET_TEX |
| Denny Lemaster | ATL | -2.35 | 196606210_PHI_ATL |
| Lee Stange | BOS | -1.34 | 196606191_BAL_BOS |
| Paul Lindblad | OAK | -0.72 | 196606192_ANA_OAK |
Based on accumulated WAA for this season up to 1966-06-21.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +002+ | 5.67 | Sandy Koufax | 126.3 | LAN |
| +003+ | 5.11 | Bob Gibson | 136 | SLN |
| +005+ | 4.69 | Jim Bunning | 125.7 | PHI |
| +007+ | 4.59 | Juan Marichal | 138 | SFN |
| +012+ | 3.06 | Mike Cuellar | 74.3 | HOU |
| +015+ | 2.82 | Claude Osteen | 112 | LAN |
| +016+ | 2.75 | Pete Richert | 123 | TEX |
| +019+ | 2.64 | Jim Maloney | 91.3 | CIN |
| +021+ | 2.63 | Tommy John | 99 | CHA |
| +022+ | 2.59 | Al Jackson | 77.3 | SLN |
| +028+ | 2.37 | Dennis Ribant | 67.7 | NYN |
| +030+ | 2.32 | Gary Bell | 103.7 | CLE |
| +031+ | 2.28 | Joe Horlen | 84 | CHA |
| +032+ | 2.18 | Mel Stottlemyre | 119 | NYA |
| +033+ | 2.15 | Phil Ortega | 100.3 | TEX |
| +049+ | 1.75 | Steve Barber | 81.7 | BAL |
| +051+ | 1.67 | Jim Kaat | 106 | MIN |
| +053+ | 1.66 | Bob Veale | 111.7 | PIT |
| +052+ | 1.66 | Juan Pizarro | 42 | CHA |
| +055+ | 1.63 | Sam McDowell | 79 | CLE |
| +056+ | 1.6 | Minnie Rojas | 28 | ANA |
| +065+ | 1.42 | Hank Aguirre | 53.3 | DET |
| +067+ | 1.38 | Clay Carroll | 56 | ATL |
| +066+ | 1.38 | Whitey Ford | 40 | NYA |
| +070+ | 1.33 | Gaylord Perry | 72.7 | SFN |
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