1931 U.S. National Championships – Men's singles
| Men's singles | |
|---|---|
| 1931 U.S. National Championships | |
| Champion | Ellsworth Vines |
| Runner-up | George Lott |
| Score | 7–9, 6–3, 9–7, 7–5 |
First-seeded Ellsworth Vines defeated fourth-seeded George Lott 7–9, 6–3, 9–7, 7–5 in the final to win the men's singles tennis title at the 1931 U.S. National Championships.