Rodney George "Rod" Laver MBE (born 9 August 1938) is an Australian former tennis

Tennis

Tennis is a sport usually played between two players or between two teams of two players each . Each player uses a racket that is strung to strike a hollow rubber ball covered with felt over a net into the opponent's court. Tennis is an Olympic sport and is played at all levels of society at all...

 player who holds the record for titles won in career, and was the World No. 1 player for seven consecutive years, from 1964 to 1970 (from 1964 to 1967 in the professional circuit) . He is the only tennis player to have twice won the Grand Slam

Grand Slam (tennis)

The four Major tennis tournaments, also called the Slams, are the most important tennis events of the year in terms of world tour ranking points, tradition, prize-money awarded, strength and size of player field, and public attention. They are the Australian Open, the French Open, Wimbledon, and...

 (all four major singles titles in the same year) – first as an amateur in 1962 and second as a professional in 1969.