1913 U.S. National Championships – Men's singles
# 1913 U.S. National Championships – Men's singles

Maurice McLoughlin defeated R. Norris Williams 6–4, 5–7, 6–3, 6–1 in the final to win the men's singles tennis title at the 1913 U.S. National Championships. The event was held at the Newport Casino in Newport, R.I. in the United States.

## Draw

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Leonard Beekman | 0 | 7 | 2 | | | | | | | | | | | |
| Nathaniel Niles | 6 | 9 | 6 | | | | | | | | | | | |
| Nathaniel Niles | 6 | 9 | 6 | | Nathaniel Niles | 4 | 5 | 6 | 1 | | | | | |
| | | | | | R. Norris Williams | 6 | 7 | 3 | 6 | | | | | |
| Watson Washburn | 1 | 5 | 3 | | R. Norris Williams | 6 | 7 | 3 | 6 | | | | | |
| R. Norris Williams | 6 | 7 | 6 | | | | | | | | | | | |
| R. Norris Williams | 6 | 7 | 6 | | | | | | | R. Norris Williams | 4 | 7 | 3 | 1 |
| | | | | | | | | | | Maurice McLoughlin | 6 | 5 | 6 | 6 |
| John Strachan | 6 | 2 | 2 | 4 | | | | | | | | | | | Maurice McLoughlin | 6 | 5 | 6 | 6 |
| Wallace F. Johnson | 2 | 6 | 6 | 6 | | | | | | | | | | |
| Wallace F. Johnson | 2 | 6 | 6 | 6 | Wallace F. Johnson | 0 | 5 | 1 | | | | | | |
| | | | | | Maurice McLoughlin | 6 | 7 | 6 | | | | | | |
| Maurice McLoughlin | 6 | 7 | 6 | | Maurice McLoughlin | 6 | 7 | 6 | | | | | | |
| William Clothier | 3 | 5 | 4 | | | | | | | | | | | |
