Quick and strong, with one of the best hook shots in the game, Hagan played for the legendary Adolph Rupp and led the Kentucky Wildcats to an 86-5 record, including a 25-0 record in the 1954 season. He played for 13 pro seasons, ten with the NBA's St. Louis Hawks and three with the ABA's Dallas Chaparrals. Hagan led the Hawks to five Western Division titles and the 1958 NBA Championship.