1973 Australian Open – Men's singles
John Newcombe defeated Onny Parun in the final, 6–3, 6–7, 7–5, 6–1 to win the men's singles tennis title at the 1973 Australian Open. Ken Rosewall was the two-time defending champion, but lost in the second round to Karl Meiler. The first round was best of 3 sets and the rest of the tournament was best of 5 sets. Seeds. The seeded players are listed below. John Newcombe is the champion; others show the round in which they were eliminated.