openera 1968 to now, in tennis Pro tennis, since 1968 Pro tennis since 1968 Present-day tennis Post-1968 tennis Modern-day tennis It began for tennis players in 1968 Current period in professional tennis 1968 to now, in pro tennis It began in 1968, for tennis Post-1968 tennis period 1968 to the present, in tennis Tennis world since 1968 Professional tennis since 1968 Tennis since 1968 Tennis period since 1968 Part of modern tennis history