The 1928 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York City, United States. The women's tournament was held from August 20 until August 27 while the men's tournament ran from September 10 until September 17. It was the 48th staging of the U.S. National Championships and the fourth Grand Slam tennis event of the year.
| 1928 U.S. National Championships | |
|---|---|
| Date | September 10–17 (M) August 20–27 (W) |
| Edition | 48th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Forest Hills, Queens New York City, United States |
| Venue | West Side Tennis Club |
| Champions | |
| Men's singles | |
 Henri Cochet[1] | |
| Women's singles | |
 Helen Wills[1] | |
| Men's doubles | |
| George Lott / John Hennessey[2] | |
| Women's doubles | |
| Hazel Hotchkiss Wightman / Helen Wills [3] | |
| Mixed doubles | |
Helen Wills /  Jack Hawkes[4] | |
Finals edit
Men's singles edit
Henri Cochet defeated Francis Hunter 4–6, 6–4, 3–6, 7–5, 6–3
Women's singles edit
Helen Wills defeated Helen Jacobs 6–2, 6–1
Men's doubles edit
George Lott / John Hennessey defeated Gerald Patterson / Jack Hawkes 6–2, 6–1, 6–2
Women's doubles edit
Hazel Hotchkiss Wightman / Helen Wills defeated 
Edith Cross / Anna McCune Harper 6–2, 6–2
Mixed doubles edit
Helen Wills / Jack Hawkes defeated Edith Cross / Edgar Moon 6–1, 6–3