# 1943 U.S. National Championships – Men's singles

Joseph Hunt defeated Jack Kramer 6–3, 6–8, 10–8, 6–0 in the final to win the men's singles tennis title at the 1943 U.S. National Championships.

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* r = Retired

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| Pancho Segura | 6 | 6 | 6 | | | | | | | | | | | |
| Seymour Greenberg | 2 | 4 | 1 | | | | | | | | | | | |
| Seymour Greenberg | 2 | 4 | 1 | | Pancho Segura | 6 | 4 | 5 | 3 | | | | | |
| | | | | | Jack Kramer | 2 | 6 | 7 | 6 | | | | | |
| Jack Kramer | 6 | 6 | 6 | | Jack Kramer | 2 | 6 | 7 | 6 | | | | | |
| Jack Tuero | 1 | 2 | 4 | | | | | | | | | | | |
| Jack Tuero | 1 | 2 | 4 | | | | | | | Jack Kramer | 3 | 8 | 8 | 0 |
| | | | | | | | | | | Joseph Hunt | 6 | 6 | 10 | 6 |
| Frank Parker | 6 | 2 | 3 | | | | | | | | | | | | Joseph Hunt | 6 | 6 | 10 | 6 |
| Joseph Hunt | 8 | 6 | 6 | | | | | | | | | | | |
| Joseph Hunt | 8 | 6 | 6 | | Joseph Hunt | 3 | 6 | 6 | 6 | | | | | |
| | | | | | Bill Talbert | 6 | 4 | 2 | 4 | | | | | |
| Bill Talbert | 6 | 4 | 8 | 6 | Bill Talbert | 6 | 4 | 2 | 4 | | | | | |
| Elwood Cooke | 1 | 6 | 6 | 4 | | | | | | | | | | |

### Earlier rounds
#### Section 1

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Segura | 6 | 6 | | | | | | | | | | | | | | |
| Bender | 3 | 3 | | Segura | 6 | 6 | | | | | | | | | | |
| Grant | 7 | 6 | | Grant | 3 | 1 | | | | | | | | | | |
| Sisson | 5 | 2 | | | | | | Segura | 6 | 6 | 6 | | | | | |
| Greenberg | 2 | 6 | 6 | | | | | Greenberg | 2 | 4 | 1 | | | | | |
| Falkenburg | 6 | 2 | 0 | Greenberg | 6 | 6 | | | | | | | | | | |
| Oliver | 6 | 0 | 6 | Oliver | 4 | 3 | | | | | | | | | | |
| Hecht | 4 | 6 | 1 | | | | | | | | | Segura | 2 | 6 | 7 | 6 |
| Kramer | 6 | 6 | | | | | | | | | | Kramer | 6 | 4 | 5 | 3 |
| Gifford | 1 | 1 | | Kramer | 6 | 6 | | | | | | | | | | |
| Falkenburg | 6 | 6 | | Falkenburg | 1 | 2 | | | | | | | | | | |
| Shea | 3 | 4 | | | | | | Kramer | 6 | 6 | 6 | | | | | |
| Tuero | | | | | | | | Tuero | 1 | 2 | 4 | | | | | |
| Wood | w/o | | | Tuero | 3 | 6 | 6 | | | | | | | | | |
| Garrett | 6 | 6 | | Garrett | 6 | 4 | 4 | | | | | | | | | |
| Kring | 1 | 2 | | | | | | | | | | | | | | |

#### Section 2

| First round | First round | First round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Parker | 6 | 6 | | | | | | | | | | | | | |
| Cushingham | 2 | 3 | Parker | 6 | 6 | | | | | | | | | | |
| Freeman | 6 | 6 | Freeman | 0 | 4 | | | | | | | | | | |
| Odman | 3 | 1 | | | | Parker | 8 | 6 | 6 | | | | | | |
| Hunt | 6 | 6 | | | | Hunt | 6 | 2 | 3 | | | | | | |
| Ager | 4 | 4 | Hunt | 6 | 6 | | | | | | | | | | |
| Brink | 6 | 6 | Brink | 1 | 0 | | | | | | | | | | |
| Evert | 1 | 1 | | | | | | | | | Hunt | 3 | 6 | 6 | 6 |
| Talbert | 6 | 6 | | | | | | | | | Talbert | 6 | 4 | 2 | 4 |
| Hare | 0 | 0 | Talbert | 6 | 6 | | | | | | | | | | |
| Ball | | | Ball | 0 | 1 | | | | | | | | | | |
| Hunt | w/o | | | | | Talbert | 6 | 4 | 8 | 6 | | | | | |
| Cooke | 6 | 6 | | | | Cooke | 1 | 6 | 6 | 4 | | | | | |
| Ray | 0 | 1 | Cooke | 6 | 6 | | | | | | | | | | |
| Everett | 6 | 6 | Everett | 2 | 2 | | | | | | | | | | |
| Paul | 1 | 2 | | | | | | | | | | | | | |