Clarence Mabry is both a respected player and tennis-teaching professional. As a player, he was nationally ranked and a state champion, winning the Southwest Conference singles and doubles title while at the University of Texas at Austin in 1946. In 1955 he established the Trinity University's men's tennis team and went on to develop a nationally recognized program. He led them to the NCAA championship in 1972, and for 18 of his 19 years as coach, his team ranked among the top 4 NCAA teams, giving him an impressive win-loss record of 319-36.
Mabry's other honors include induction into the Intercollegiate Tennis Association Men's Tennis Collegiate Hall of Fame, Texas Tennis Hall of Fame, San Antonio Hall of Fame, Trinity University Hall of Fame, and the University of Texas Hall of Honor.