Sandy Koufax faced Warren Spahn a total of 36 times during their careers. In those matchups, Koufax had a strong performance, with a batting average against him of .244, while Spahn struggled against Koufax, posting a .196 batting average. Their encounters were notable for the pitching prowess both players showcased.
Once in 1957
He won the Award 3 times, 1963, 1965 and 1966.
97 times, as best as I can tell.
164
183
136
110
21
22
14
148
363