| 1891 U.S. National Championships | |
|---|---|
| Date | August 22 - August 31 (M) June 23 - June 27 (W) |
| Edition | 11th |
| Category | Grand Slam |
| Surface | Grass |
| Location | Newport, R.I., United States (M) Philadelphia, PA, United States (W) |
| Champions | |
| Men's singles | |
 Oliver Campbell[1] | |
| Women's singles | |
 Mabel Cahill[1] | |
| Men's doubles | |
| Oliver Campbell / Bob Huntington | |
| Women's doubles | |
| Mabel Cahill / Emma Leavitt Morgan | |
List of champions of the 1891 U.S. National Championships (now known as the US Open). The men's tournament was held from August 22 to August 31 on the outdoor grass courts at the Newport Casino in Newport, Rhode Island. The women's tournament was held from June 23 to June 27 on the outdoor grass courts at the Philadelphia Cricket Club in Philadelphia, Pennsylvania. It was the 11th U.S. National Championships and the second Grand Slam tournament of the year.:[1]
- ^ a b c Bud Collins (2010). The Bud Collins History of Tennis (2nd ed.). [New York]: New Chapter Press. pp. 454–483. ISBN 978-0942257700.