The 1977 U.S. Pro Tennis Championships was a men's tennis tournament played on outdoor green clay courts (Har-Tru) at the Longwood Cricket Club in Chestnut Hill, Massachusetts in the United States. The event was categorized as a 4 Star tournament and was part of the 1977 Grand Prix circuit. It was the 50th edition of the tournament and was held from August 22 through August 30, 1977. Third-seeded Manuel Orantes won the singles title and the accompanying $32,000 first-prize money as well as 125 Grand Prix ranking points.[1] First-seeded Jimmy Connors withdrew after the quarterfinals due to a back injury.[2]
Manuel Orantes defeated 
Eddie Dibbs 7–6, 7–5, 6–4
Bob Lutz / Stan Smith defeated Brian Gottfried / Bob Hewitt 6–3, 6–4