List of Champions of the 1931 U.S. National Championships (now known as the US Open):
Ellsworth Vines defeated George Lott 7-9 6-3 9-7 7-5
Helen Wills Moody defeated Eileen Bennett Whittingstall 6-4, 6-1
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| Preceded by 1930 U.S. National Championships |
U.S. National Championships | Succeeded by 1932 U.S. National Championships |
| Preceded by 1931 Wimbledon Championships |
Grand Slams | Succeeded by 1932 Australian Championships |