Australian Rod ''Rocket" Laver (1938) Wins 1968 Wimbledon Mens singles Tennis Final. Called the greatest tennis player of the 20th century for good reason. He holds the record for most singles titles won in the history of tennis, with 200 career titles. Ranked World No. 1 for 7 consecutive years, from 1964-1970. The only player in the history of tennis to win two Grand Slams—taking the singles titles of the Australian Open, French Open, Wimbledon, & the U.S. Open in a single year.