1973 Australian Open – Men's singles
| Men's singles | |
|---|---|
| 1973 Australian Open | |
| Champion | John Newcombe |
| Runner-up | Onny Parun |
| Score | 6–3, 6–7, 7–5, 6–1 |
| Draw | 56 |
| Seeds | 12 |
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. It was his fifth major singles title.
Ken Rosewall was the two-time defending champion, but lost in the second round to Karl Meiler.
The first round was best-of-three sets, and the rest of the tournament was best-of-five sets.