# 2023 NSW Open – Men's singles

Hsu Yu-hsiou was the defending champion but chose not to defend his title.
Taro Daniel won the title after defeating Marc Polmans 6–2, 6–4 in the final.

## Seeds

* Thanasi Kokkinakis (semifinals, retired)
* Rinky Hijikata (semifinals)
* Taro Daniel (champion)
* James Duckworth (withdrew)
* Shintaro Mochizuki (quarterfinals, retired)
* Marc Polmans (final)
* Hong Seong-chan (first round)
* Tristan Schoolkate (first round)

## 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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Thanasi Kokkinakis | 2$^r$ | | | | | | |
| 6 | Marc Polmans | 3 | | | | | | |
| 6 | Marc Polmans | 3 | | | 6 | Marc Polmans | 2 | 4 |
| | | | | | 3 | Taro Daniel | 6 | 6 |
| 3 | Taro Daniel | 3 | 6 | 7$^7$ | 3 | Taro Daniel | 6 | 6 |
| 2 | Rinky Hijikata | 6 | 2 | 6$^5$ | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals |
| 1 | T Kokkinakis | 6 | 6 | | | | | | | | | | | | | |
| | F Peliwo | 3 | 1 | | 1 | T Kokkinakis | 7 | 7 | | | | | | | | |
| Q | A Rai | 2 | 6$^2$ | | | P Sekulic | 5 | 5 | | | | | | | | |
| | P Sekulic | 6 | 7$^7$ | | | | | | 1 | T Kokkinakis | 6 | 7$^7$ | | | | |
| Q | H Moriya | 6 | 7$^{10}$ | | | | | | | R Noguchi | 3 | 6$^5$ | | | | |
| | N Nakagawa | 3 | 6$^8$ | | Q | H Moriya | 1 | 2 | | | | | | | | |
| | R Noguchi | 6 | 6 | | | R Noguchi | 6 | 6 | | | | | | | | |
| 7 | S-c Hong | 2 | 2 | | | | | | | | | | | 1 | T Kokkinakis | 2$^r$ |
| LL | B Mott | 6 | 6 | | | | | | | | | | | 6 | M Polmans | 3 |
| Q | R Statham | 3 | 4 | | LL | B Mott | 6 | 6 | | | | | | | | |
| Q | R Seggerman | 6 | 4 | 6 | Q | R Seggerman | 2 | 3 | | | | | | | | |
| | B Lock | 3 | 6 | 4 | | | | | LL | B Mott | 3 | 6 | 3 | | | |
| WC | Jacob Bradshaw | 5 | 2 | | | | | | 6 | M Polmans | 6 | 3 | 6 | | | |
| | A Weber | 7 | 6 | | | A Weber | 4 | 4 | | | | | | | | |
| | C Sinclair | 4 | 2 | | 6 | M Polmans | 6 | 6 | | | | | | | | |
| 6 | M Polmans | 6 | 6 | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | S Mochizuki | 6 | 6 | | | | | | | | | | | | | | | | |
| | O Jasika | 4 | 4 | | 5 | S Mochizuki | 7$^{12}$ | 7 | | | | | | | | | | | |
| | Y Shimizu | 3 | 2 | | | K Uchida | 6$^{10}$ | 5 | | | | | | | | | | | |
| | K Uchida | 6 | 6 | | | | | | | 5 | S Mochizuki | 1$^r$ | | | | | | | |
| | L Saville | 7 | 6 | | | | | | | 3 | T Daniel | 3 | | | | | | | |
| WC | B Ellis | 5 | 2 | | | L Saville | 4 | 2 | | | | | | | | | | | |
| | Y Uchiyama | 2 | 1$^r$ | | 3 | T Daniel | 6 | 6 | | | | | | | | | | | |
| 3 | T Daniel | 6 | 2 | | | | | | | | | | | | 3 | T Daniel | 3 | 6 | 7$^7$ |
| 8 | T Schoolkate | 6$^9$ | 4 | | | | | | | | | | | | 2 | R Hijikata | 6 | 2 | 6$^5$ |
| Q | J-s Nam | 7$^{11}$ | 6 | | Q | J-s Nam | 6 | 6 | | | | | | | | | | | |
| | D Sweeny | 4 | 6 | 7$^9$ | | D Sweeny | 4 | 2 | | | | | | | | | | | |
| LL | Y Takahashi | 6 | 3 | 6$^7$ | | | | | | Q | J-s Nam | 7$^7$ | 5 | 6$^5$ | | | | | |
| WC | Pavle Marinkov | 6$^5$ | 2 | | | | | | | 2 | R Hijikata | 6$^5$ | 7 | 7$^7$ | | | | | |
| SE | C Wong | 7$^7$ | 6 | | SE | C Wong | 6 | 3 | 2 | | | | | | | | | | |
| Q | Matthew Dellavedova | 3 | 4 | | 2 | R Hijikata | 4 | 6 | 6 | | | | | | | | | | |
| 2 | R Hijikata | 6 | 6 | | | | | | | | | | | | | | | | |