1921 U.S. National Championships
| 1921 U.S. National Championships | |
|---|---|
| Date | 9 September – 19 September (M) 15 August – 20 August (W) |
| Edition | 41st |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Philadelphia, PA, United States |
| Venue | Germantown Cricket Club |
| Champions | |
| Men's Singles | |
 Bill Tilden |
|
| Women's Singles | |
|
Molla Bjurstedt Mallory |
|
| Men's Doubles | |
|
Bill Tilden / Vincent Richards |
|
| Women's Doubles | |
Mary Browne /  Louise Riddell Williams |
|
| Mixed Doubles | |
|
Mary Browne / Bill Johnston |
|
The 1921 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the Germantown Cricket Club in Philadelphia, United States. The tournament ran from 9 September until 19 September. It was the 41st staging of the U.S. National Championships and the third Grand Slam tennis event of the year.
Bill Tilden defeated Wallace F. Johnson 6–1, 6–3, 6–1
Molla Bjurstedt Mallory defeated Mary Browne 4–6, 6–4, 6–2
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