List of Champions of the 1890 U.S. National Championships (now known as the US Open):
Oliver Campbell defeated Henry Slocum 6-2 4-6 6-3 6-1
Ellen Roosevelt defeated Bertha Townsend 6-2, 6-2
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| Preceded by 1889 U.S. National Championships |
U.S. National Championships | Succeeded by 1891 U.S. National Championships |
| Preceded by 1890 Wimbledon Championships |
Grand Slams | Succeeded by 1891 Wimbledon Championships |