1923 U.S. National Championships – Men's singles
# 1923 U.S. National Championships – Men's singles

Three-time defending champion Bill Tilden defeated Bill Johnston in the final, 6–4, 6–1, 6–4 to win the men's singles tennis title at the 1923 U.S. National Championships. It was Tilden's fourth U.S. Championships singles title and sixth major singles title overall.

## Draw

### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Final eight

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Bill Tilden | 6 | 6 | 6 | | | | | | | | | | |
| Manuel Alonso | 0 | 0 | 2 | | | | | | | | | | |
| Manuel Alonso | 0 | 0 | 2 | | | Bill Tilden | 6 | 7 | 6 | | | | |
| | | | | | | Brian Norton | 3 | 5 | 2 | | | | |
| R. Norris Williams | 6 | 3 | 4 | 6 | 4 | Brian Norton | 3 | 5 | 2 | | | | |
| Brian Norton | 1 | 6 | 6 | 3 | 6 | | | | | | | | |
| Brian Norton | 1 | 6 | 6 | 3 | 6 | | | | | Bill Tilden | 6 | 6 | 6 |
| | | | | | | | | | | Bill Johnston | 4 | 1 | 4 |
| Bill Johnston | 8 | 6 | 7 | | | | | | | | | | | Bill Johnston | 4 | 1 | 4 |
| Frank Anderson | 6 | 1 | 5 | | | | | | | | | | |
| Frank Anderson | 6 | 1 | 5 | | | Bill Johnston | 6 | 6 | 7 | | | | |
| | | | | | | Frank Hunter | 4 | 2 | 5 | | | | |
| Frank Hunter | 6 | 6 | 8 | | | Frank Hunter | 4 | 2 | 5 | | | | |
| Robert Kinsey | 2 | 4 | 6 | | | | | | | | | | |
