Clark Graebner served as player-coach for the Cleveland Nets in World Team Tennis in 1974 and also played in 1975. He won three U.S. Men’s national singles titles and six doubles titles between 1963 and 1971. He recorded 16 singles wins and four doubles wins in 11 Davis Cup ties over a five year period. Clark was ranked in the Top Ten in U.S. Men’s Singles eight times in nine years between 1964 and 1972, and was in the Top Ten in doubles nine times between 1962 and 1971, including the top ranking from 1965 to 1967.