Pasarell competed in major tournaments from 1960 through 1979, with his most successful showings coming in doubles. He reached the finals in men's doubles at the U.S. Championships in 1965 with Frank Froehling and 1969 with Dennis Ralston, the French Open with Arthur Ashe in 1970, and the Australian Open in 1977 with Erik van Dillen. He was a quarterfinalist at the U.S. National Championships in 1965 and Wimbledon in 1976. Pasarell was also a member of the U.S. Davis Cup team in 1966, 1967, 1968, and 1974. In doubles, Pasarell's most significant wins were the 1967 U.S. National Indoors with Arthur Ashe; the inaugural American Airlines Games in 1974 with Sherwood Stewart which evolved to the current tournament in Indian Wells and the Alan King Classic in 1976 with Arthur Ashe. The latter two at the time were two of the richest most prestigious tournaments in the world.