| Starter | Tm | Tier | Game |
|---|---|---|---|
| Don Drysdale | LAN | 3.77 | 196404190_ATL_LAN |
| Juan Marichal | SFN | 3.65 | 196404190_CIN_SFN |
| Warren Spahn | ATL | 3.01 | 196404190_ATL_LAN |
| Camilo Pascual | MIN | 2.14 | 196404191_MIN_DET |
| Turk Farrell | HOU | 1.49 | 196404200_SLN_HOU |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Ray Sadecki | SLN | -3.78 | 196404200_SLN_HOU |
| Jim Owens | HOU | -3.68 | 196404210_CIN_HOU |
| Al Jackson | NYN | -2.65 | 196404190_PIT_NYN |
| Frank Lary | DET | -1.98 | 196404210_DET_ANA |
| Mudcat Grant | CLE | -0.92 | 196404210_CLE_OAK |
Based on accumulated WAA for this season up to 1964-04-21.
| Rank | WAA | Name | IP | Tm |
|---|
_