Rodney George Laver AC, MBE (born 9 August 1938) is an Australian former tennis player widely regarded as one of the greatest in the history of the sport. He was the No. 1 ranked professional from 1964 to 1970, spanning four years before and three years after the start of the Open Era in 1968. He also was the No. 1 ranked amateur in 1961 -- 62.
when did the open era begin in tennis
1968