Kelleher was the New England Intercollegiate Doubles Champion in 1933 and won the Eastern Collegiate Doubles the same year.[citation needed] He won the Canadian mixed doubles championship in 1947 with his wife Gracyn Wheeler Kelleher.[citation needed] Kelleher was the U.S. Davis Cup Captain in 1962–63 (winning in 1963) and was a three-time U.S. Hard Court 45s doubles champion.[citation needed]
As president of the United States Lawn Tennis Association (USLTA) in 1967–68, Kelleher helped make open tennis a reality in 1968. Prior to his presidency, major tennis tournaments were closed to professional players and prize money was not offered. Kelleher was instrumental in changing this system, thus allowing anyone to play and instituting legitimate prize money in tournaments.[6] He also participated extensively in the activities of the Southern California Tennis Association.[citation needed]