| Starter | Tm | Tier | Game |
|---|---|---|---|
| Juan Marichal | SFN | 10.91 | 196605260_PHI_SFN |
| Jim Bunning | PHI | 6.96 | 196605260_PHI_SFN |
| Sam McDowell | CLE | 4.37 | 196605250_CLE_DET |
| Bob Gibson | SLN | 3.06 | 196605260_CHN_SLN |
| Dean Chance | ANA | 2.43 | 196605250_ANA_NYA |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Diego Segui | TEX | -3.27 | 196605250_OAK_TEX |
| Jerry Stephenson | BOS | -2.54 | 196605250_MIN_BOS |
| Bob Buhl | PHI | -2.43 | 196605240_PHI_LAN |
| Jack Fisher | NYN | -2.14 | 196605240_NYN_HOU |
| Fred Talbot | OAK | -1.82 | 196605250_OAK_TEX |
Based on accumulated WAA for this season up to 1966-05-26.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.32 | Juan Marichal | 92 | SFN |
| +006+ | 2.52 | Chris Short | 80.3 | PHI |
| +007+ | 2.47 | Jim Bunning | 79.7 | PHI |
| +009+ | 2.37 | Sandy Koufax | 73.3 | LAN |
| +011+ | 2.28 | Jim Maloney | 43.7 | CIN |
| +012+ | 2.2 | Mike Cuellar | 46.3 | HOU |
| +015+ | 2 | Bob Gibson | 84.3 | SLN |
| +016+ | 1.9 | Mel Stottlemyre | 71 | NYA |
| +017+ | 1.88 | Al Jackson | 33 | SLN |
| +023+ | 1.65 | Tommy John | 60.3 | CHA |
| +025+ | 1.57 | Sam McDowell | 68.3 | CLE |
| +027+ | 1.49 | Clay Carroll | 31 | ATL |
| +028+ | 1.42 | Pete Richert | 68 | TEX |
| +030+ | 1.35 | Jim O'Toole | 34.3 | CIN |
| +032+ | 1.33 | Dick Ellsworth | 67.7 | CHN |
| +033+ | 1.32 | John O'Donoghue | 18.3 | CLE |
| +035+ | 1.26 | Luis Tiant | 43.7 | CLE |
| XXXXX | 1.25 | Claude Osteen | 72.3 | LAN |
| XXXXX | 1.19 | Whitey Ford | 40 | NYA |
| XXXXX | 0.99 | Jose Santiago | 50 | BOS |
| XXXXX | 0.94 | Milt Pappas | 53.7 | CIN |
| XXXXX | 0.93 | Bill Hands | 45.7 | CHN |
| XXXXX | 0.91 | Sonny Siebert | 62 | CLE |
| XXXXX | 0.9 | Barry Latman | 43 | HOU |
| XXXXX | 0.87 | Phil Ortega | 52.7 | TEX |
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