Boris Becker defeated Ivan Lendl in the final, 7–6(7–2), 1–6, 6–3, 7–6(7–4) to win the men's singles tennis title at the 1989 US Open. It was his first US Open title and fourth major title overall. Becker saved a match point en route to the title against Derrick Rostagno in the second round by way of a lucky net cord. This was Lendl's eighth consecutive singles final appearance at the US Open; he became the first man in the Open Era to finish runner-up five times at the same major. Mats Wilander was the defending champion, but lost in the second round to Pete Sampras.

Seeds

The seeded players are listed below. Boris Becker is the champion; others show the round in which they were eliminated.

Draw

Finals

Top half

Section 1

Section 2

Section 3

Section 4

Bottom half

Section 5

Section 6

Section 7

Section 8

Matches

Final

Semifinals

Quarterfinals

Played on Stadium Court, National Tennis Center, Flushing Meadows, New York. Originally shown by USA Network with play by play commentators: Ted Robinson and Vitas Gerulaitis After a solid opening set, Agassi loses the next two, with Connors winning the third 6–0. Agassi then has to save three break points to win the fourth set to tie the match. The fifth starts in Agassi's favor, breaking twice and jumping to a 5–1 lead, but Connors rallies back with a break to 5–4. Finally, with double match point, Agassi misses a backhand down the line, but then pulls off a backhand dropshot which Connors hits long.

Early rounds