# 2023 Shenzhen Longhua Open – Men's singles

Zhang Zhizhen was the defending champion but chose not to defend his title.
Aleksandar Kovacevic won the title after defeating Nuno Borges 7–6$^{(7–4)}$, 7–6$^{(7–5)}$ in the final.

## Seeds

* Thanasi Kokkinakis (second round)
* Pedro Cachin (semifinals)
* Nuno Borges (final)
* Fabio Fognini (first round)
* James Duckworth (second round)
* Aleksandar Kovacevic (champion)
* Térence Atmane (second round)
* Hsu Yu-hsiou (quarterfinals)

## 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 | Final | Final | Final | Final |
| Q | Egor Gerasimov | 2 | 1 | | | | |
| 3 | Nuno Borges | 6 | 6 | | | | |
| 3 | Nuno Borges | 6 | 6 | 3 | Nuno Borges | 6$^4$ | 6$^5$ |
| | | | | 6 | Aleksandar Kovacevic | 7$^7$ | 7$^7$ |
| 6 | Aleksandar Kovacevic | 6 | 7$^9$ | 6 | Aleksandar Kovacevic | 7$^7$ | 7$^7$ |
| 2 | Pedro Cachin | 4 | 6$^7$ | | | | |

### 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 | Semifinals |
| 1 | T Kokkinakis | 6 | 3 | 6 | | | | | | | | | | | | | |
| Q | C Sinclair | 2 | 6 | 3 | 1 | T Kokkinakis | 3 | 4 | | | | | | | | | |
| | B Zhukayev | 6 | 6 | | | B Zhukayev | 6 | 6 | | | | | | | | | |
| Q | Z Li | 4 | 4 | | | | | | | B Zhukayev | 7$^7$ | 2 | 3 | | | | |
| | L Tu | 6 | 4 | 4 | | | | | Q | E Gerasimov | 6$^4$ | 6 | 6 | | | | |
| Q | E Gerasimov | 4 | 6 | 6 | Q | E Gerasimov | 7$^7$ | 6 | | | | | | | | | |
| | L Giustino | 6$^4$ | 3 | | 7 | T Atmane | 6$^4$ | 3 | | | | | | | | | |
| 7 | T Atmane | 7$^7$ | 6 | | | | | | | | | | | Q | E Gerasimov | 2 | 1 |
| 3 | N Borges | 7 | 6 | | | | | | | | | | | 3 | N Borges | 6 | 6 |
| | S Diez | 5 | 2 | | 3 | N Borges | 6 | 6 | | | | | | | | | |
| | Y Bu | 3 | 6 | 2 | | Y Bu | 3 | 4 | | | | | | | | | |
| | J McCabe | 6 | 3 | 0$^r$ | | | | | 3 | N Borges | 7$^7$ | 6 | | | | | |
| | L Saville | 2 | 5 | | | | | | 8 | Y-h Hsu | 6$^0$ | 0 | | | | | |
| | C-h Tseng | 6 | 7 | | | C-h Tseng | 3 | 4 | | | | | | | | | |
| Q | R Te | 2 | 1 | | 8 | Y-h Hsu | 6 | 6 | | | | | | | | | |
| 8 | Y-h Hsu | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | A Kovacevic | 6 | 6 | | | | | | | | | | | | | | |
| | P Sekulic | 1 | 4 | | 6 | A Kovacevic | 6 | 6 | | | | | | | | | |
| WC | S Tang | 3 | 4 | | | A Kachmazov | 1 | 4 | | | | | | | | | |
| | A Kachmazov | 6 | 6 | | | | | | | 6 | A Kovacevic | 6 | 6 | | | | |
| WC | Sun Qian | 3 | 3 | | | | | | | | D Yevseyev | 2 | 4 | | | | |
| Q | J Cui | 6 | 6 | | Q | J Cui | 4 | 0 | | | | | | | | | |
| | D Yevseyev | 6 | 7$^8$ | | | D Yevseyev | 6 | 6 | | | | | | | | | |
| 4/WC | F Fognini | 4 | 6$^6$ | | | | | | | | | | | 6 | A Kovacevic | 6 | 7$^9$ |
| 5 | J Duckworth | 6 | 7$^7$ | | | | | | | | | | | 2 | P Cachin | 4 | 6$^7$ |
| | K Uchida | 0 | 6$^2$ | | 5 | J Duckworth | 6 | 5 | 2 | | | | | | | | |
| | J Jung | 6 | 2 | 6 | | J Jung | 3 | 7 | 6 | | | | | | | | |
| | E Donskoy | 4 | 6 | 4 | | | | | | | J Jung | 3 | 4 | | | | |
| | Dominik Palán | 4 | 6$^4$ | | | | | | | 2 | P Cachin | 6 | 6 | | | | |
| | T-l Wu | 6 | 7$^7$ | | | T-l Wu | 6$^5$ | 7$^7$ | 6$^6$ | | | | | | | | |
| Q | Y Bai | 4 | 3 | | 2 | P Cachin | 7$^7$ | 6$^3$ | 7$^8$ | | | | | | | | |
| 2 | P Cachin | 6 | 6 | | | | | | | | | | | | | | |