Rodney George Laver (born 9 August 1938) is an Australian former tennis player. Laver was ranked the world number 1 professional player indisputably for five years from 1965 to 1969 and by some sources also in 1964 and 1970. He was also ranked as the number 1 amateur in 1961 and 1962. Laver won 198 singles titles which is the most won by a player in history. Laver won 11 major singles titles and 8 Pro major titles. He completed the Grand Slam (winning all four majors in a calendar year) in singles twice in 1962 and 1969; the latter remains the only time a man has done so in the Open Era.
https://en.wikipedia.org/wiki/Rod_Laver