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The 1970 U.S. Pro Tennis Championships was a men's tennis tournament played on outdoor hard courts at the Longwood Cricket Club in Chestnut Hill, Massachusetts, USA. It was classified as a Class 1 category tournament and was part of the 1970 Grand Prix circuit. It was the 43rd edition of the tournament and was held from August 3 through August 9, 1970. Fourth-seeded Tony Roche won the singles title and the accompanying $12,000 first prize money.