1989 US Open – Men's singles

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 at the US Open; he was 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; Sampras would win the title the following year.