Ken Rosewall is a legendary tennis player who has achieved success throughout his career. He is one of the few players to have won Grand Slam titles in both the amateur and professional eras of tennis. He has won 15 singles titles and 11 doubles titles in Grand Slam tournaments,
From Wikipedia
Kenneth Robert Rosewall is an Australian former world No. 1 professional tennis player. Rosewall won 147 singles titles, including 23 majors: a record 15 Pro Majors and eight Grand Slam tournaments. He also won 15 Pro Majors in doubles and nine Grand Slam doubles titles. Rosewall achieved a Pro Slam in singles in 1963 by winning the three Pro Majors in one year, and completed the career Grand Slam in doubles.