See main article: 1989 Australian Open.
Ivan Lendl defeated Miloslav Mečíř in the final, 6–2, 6–2, 6–2 to win the men's singles tennis title at the 1989 Australian Open. It was his first Australian Open title and seventh major singles title overall.
Mats Wilander was the defending champion, but lost in the second round to Ramesh Krishnan.
This was the first Australian Open in which future world No. 1 and 14-time major singles champion Pete Sampras competed in the main draw.
The seeded players are listed below. Ivan Lendl is the champion; others show the round in which they were eliminated.
Mats Wilander (second round) Stefan Edberg (quarterfinals, withdrew)
Jakob Hlasek (first round)
Henri Leconte (first round)
John McEnroe (quarterfinals) Yannick Noah (first round) Aaron Krickstein (fourth round)
Thomas Muster (semifinals) Mikael Pernfors (third round)
Pat Cash (fourth round) Jonas Svensson (quarterfinals) John Fitzgerald (second round)
Amos Mansdorf (fourth round)See main article: 1989 Australian Open – Men's singles qualifying.