1977 US Open – Men's singles

Guillermo Vilas defeated the defending champion Jimmy Connors in the final, 2–6, 6–3, 7–6^(7–4), 6–0 to win the men's singles tennis title at the 1977 US Open. It was his first US Open title and second major title overall.

This was the third and last edition of the US Open to be played on clay courts; it switched the following year to hard courts.

The competition was played best-of-three sets in the first four rounds, followed by best-of-five sets from the quarterfinals onward.