Swiss tennis player Stan Wawrinka paused to applaud a fan singing constantly during the former's quarter-final match against Frenchman Jo-Wilfried Tsonga in the Australian Open on Tuesday. The incident occurred when Wawrinka and Tsonga were playing a tiebreaker. The man, singing a version of the Christian hymn 'Amazing Grace', was applauded by the spectators, with Wawrinka following suit.