# 2023 International Challenger Zhangjiagang – Singles

Marc Polmans was the defending champion but chose not to defend his title.
Térence Atmane won the title after defeating Mikalai Haliak 6–1, 6–2 in the final.

## Seeds

* Bu Yunchaokete (first round)
* Térence Atmane (champion)
* Kaichi Uchida (first round)
* Rio Noguchi (first round)
* Li Tu (quarterfinals)
* Jason Jung (withdrew)
* Ričardas Berankis (semifinals)
* James McCabe (semifinals, retired)

## 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 |
| 8 | James McCabe | 2 | 2$^r$ | | | | | |
| Q | Mikalai Haliak | 6 | 3 | | | | | |
| Q | Mikalai Haliak | 6 | 3 | | Q | Mikalai Haliak | 1 | 2 |
| | | | | | 2 | Térence Atmane | 6 | 6 |
| 7 | Ričardas Berankis | 1 | 6 | 3 | 2 | Térence Atmane | 6 | 6 |
| 2 | Térence Atmane | 6 | 3 | 6 | | | | |

### Top 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 |
| 1 | Y Bu | 7$^9$ | 3 | 6$^6$ | | | | | | | | | | | | | | |
| WC | R Te | 6$^7$ | 6 | 7$^8$ | WC | R Te | 6 | 6 | | | | | | | | | | |
| | F Peliwo | 6 | 3 | 6 | | F Peliwo | 3 | 1 | | | | | | | | | | |
| | Dominik Palán | 2 | 6 | 2 | | | | | | WC | R Te | 6$^6$ | 6 | 0 | | | | |
| Q | Leonid Sheyngezikht | 4 | 1 | | | | | | | 8 | J McCabe | 7$^8$ | 3 | 6 | | | | |
| | L Giustino | 6 | 6 | | | L Giustino | 4 | 6 | 1 | | | | | | | | | |
| | L Saville | 6$^3$ | 6 | 3 | 8 | J McCabe | 6 | 3 | 6 | | | | | | | | | |
| 8 | J McCabe | 7$^7$ | 2 | 6 | | | | | | | | | | | 8 | J McCabe | 2 | 2$^r$ |
| 4 | R Noguchi | 3 | 6 | 2 | | | | | | | | | | | Q | M Haliak | 6 | 3 |
| Q | Xiao Linang | 6 | 4 | 6 | Q | L Xiao | 4 | 1 | | | | | | | | | | |
| Q | Mikalai Haliak | 6 | 7 | | Q | M Haliak | 6 | 6 | | | | | | | | | | |
| | M Sasikumar | 3 | 5 | | | | | | | Q | M Haliak | 6 | 6 | | | | | |
| | E Zhu | 5 | 6$^6$ | | | | | | | LL | Y Takahashi | 4 | 4 | | | | | |
| | S Sakellaridis | 7 | 7$^8$ | | | S Sakellaridis | 3 | 1 | | | | | | | | | | |
| Q | J Cui | 2 | 2 | | LL | Y Takahashi | 6 | 6 | | | | | | | | | | |
| LL | Y Takahashi | 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 |
| 7 | R Berankis | 6 | 7 | | | | | | | | | | | | | | | | |
| | Y Uchiyama | 4 | 5 | | 7 | R Berankis | 6 | 6 | | | | | | | | | | | |
| Q | Liu Hanyi | 4 | 6 | 3 | | R Strombachs | 4 | 2 | | | | | | | | | | | |
| | R Strombachs | 6 | 3 | 6 | | | | | | 7 | R Berankis | 7 | 6$^4$ | 6 | | | | | |
| | NH Lý | 5 | 6 | 6 | | | | | | LL | C Sinclair | 5 | 7$^7$ | 1 | | | | | |
| | N Chappell | 7 | 3 | 2 | | NH Lý | 3 | 6 | 1 | | | | | | | | | | |
| LL | C Sinclair | 6 | 3 | 6 | LL | C Sinclair | 6 | 1 | 6 | | | | | | | | | | |
| 3 | K Uchida | 3 | 6 | 4 | | | | | | | | | | | 7 | R Berankis | 1 | 6 | 3 |
| 5 | L Tu | 6 | 6 | | | | | | | | | | | | 2 | T Atmane | 6 | 3 | 6 |
| | P Sekulic | 3 | 4 | | 5 | L Tu | 6 | 6 | | | | | | | | | | | |
| Alt | R Statham | 6 | 3 | 7$^7$ | Alt | R Statham | 2 | 2 | | | | | | | | | | | |
| WC | H Li | 3 | 6 | 6$^2$ | | | | | | 5 | L Tu | 3 | 5 | | | | | | |
| | A Weber | 2 | 2 | | | | | | | 2 | T Atmane | 6 | 7 | | | | | | |
| Alt | Alafia Ayeni | 6 | 6 | | Alt | A Ayeni | 1 | 6 | 2 | | | | | | | | | | |
| WC | F Sun | 6 | 6$^1$ | 6$^9$ | 2 | T Atmane | 6 | 3 | 6 | | | | | | | | | | |
| 2 | T Atmane | 4 | 7$^7$ | 7$^{11}$ | | | | | | | | | | | | | | | |