Pro Tennis Championships was a men's tennis tournament played on outdoor hard courts at the Longwood Cricket Club in Boston, USA and was part of the 1971 World Championship Tennis circuit.

Sixth-seeded Ken Rosewall won the singles title, his third U.S.

Pro title, and the accompanying $10,000 first-prize money.

The final was watched by 5,500 spectators.

[2][3] Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.