# 2023 Shanghai Challenger – Singles

Yasutaka Uchiyama was the defending champion but retired from his second round match against Christopher O'Connell.
O'Connell won the title after defeating Yosuke Watanuki 6–3, 7–5 in the final.

## Seeds

* Christopher O'Connell (champion)
* Yosuke Watanuki (final)
* Marc Polmans (first round)
* Shang Juncheng (semifinals)
* Wu Tung-lin (second round)
* Bu Yunchaokete (second round)
* Térence Atmane (second round)
* Rio Noguchi (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 | Final | Final | Final | Final |
| 1 | Christopher O'Connell | 6 | 6 | | | | |
| | Li Tu | 2 | 4 | | | | |
| | Li Tu | 2 | 4 | 1 | Christopher O'Connell | 6 | 7 |
| | | | | 2 | Yosuke Watanuki | 3 | 5 |
| 4 | Shang Juncheng | 4 | 2 | 2 | Yosuke Watanuki | 3 | 5 |
| 2 | Yosuke Watanuki | 6 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | C O'Connell | 6 | 6 | | | | | | | | | | | | | | |
| | L Saville | 4 | 0 | | 1 | C O'Connell | 7$^7$ | 4 | | | | | | | | | |
| WC | Liu Hanyi | 1 | 6$^4$ | | | Y Uchiyama | 6$^3$ | 1$^r$ | | | | | | | | | |
| | Y Uchiyama | 6 | 7$^7$ | | | | | | | 1 | C O'Connell | 6 | 6 | | | | |
| Q | Mu Tao | 3 | 6 | 5 | | | | | | Q | Y Bai | 0 | 2 | | | | |
| Q | Y Bai | 6 | 4 | 7 | Q | Y Bai | 6 | 6 | | | | | | | | | |
| | Dominik Palán | 6 | 6 | | | D Palán | 3 | 2 | | | | | | | | | |
| 8 | R Noguchi | 2 | 4 | | | | | | | | | | | 1 | C O'Connell | 6 | 6 |
| 3 | M Polmans | 1 | 3 | | | | | | | | | | | | L Tu | 2 | 4 |
| | F Peliwo | 6 | 6 | | | F Peliwo | 6$^5$ | 2 | | | | | | | | | |
| | P Sekulic | 1 | 0 | | | L Tu | 7$^7$ | 6 | | | | | | | | | |
| | L Tu | 6 | 6 | | | | | | | | L Tu | 7$^8$ | 6 | | | | |
| | A Bellier | 6 | 7 | | | | | | | | A Bellier | 6$^6$ | 2 | | | | |
| Q | A Kadhe | 4 | 5 | | | A Bellier | 7$^7$ | 3 | 6 | | | | | | | | |
| | O Jasika | 3 | 6$^1$ | | 7 | T Atmane | 6$^5$ | 6 | 4 | | | | | | | | |
| 7 | T Atmane | 6 | 7$^7$ | | | | | | | | | | | | | | |

### 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 | Y Bu | 6 | 6 | | | | | | | | | | | | | | |
| WC | R Te | 2 | 4 | | 6 | Y Bu | 1 | 4 | | | | | | | | | |
| | H Moriya | 1 | 2 | | | L Giustino | 6 | 6 | | | | | | | | | |
| | L Giustino | 6 | 6 | | | | | | | | L Giustino | 1 | 4 | | | | |
| Alt | M Sasikumar | 3 | 4 | | | | | | | 4 | J Shang | 6 | 6 | | | | |
| | D Sweeny | 6 | 6 | | | D Sweeny | 4 | 3 | | | | | | | | | |
| LL | R Strombachs | 4 | 6$^4$ | | 4 | J Shang | 6 | 6 | | | | | | | | | |
| 4 | J Shang | 6 | 7$^7$ | | | | | | | | | | | 4 | J Shang | 4 | 2 |
| 5 | T-l Wu | 7$^7$ | 3 | 6 | | | | | | | | | | 2 | Y Watanuki | 6 | 6 |
| WC | F Sun | 6$^5$ | 6 | 2 | 5 | T-l Wu | 6 | 1 | 2 | | | | | | | | |
| Q | NH Lý | 5 | 6 | 6 | Q | NH Lý | 3 | 6 | 6 | | | | | | | | |
| Q | N Chappell | 7 | 4 | 0 | | | | | | Q | NH Lý | 2 | 0 | | | | |
| Q | Alafia Ayeni | 2 | 6 | 3 | | | | | | 2 | Y Watanuki | 6 | 6 | | | | |
| SE | Mikalai Haliak | 6 | 3 | 6 | SE | M Haliak | 1 | 1 | | | | | | | | | |
| | A Bolt | 4 | 0 | | 2 | Y Watanuki | 6 | 6 | | | | | | | | | |
| 2 | Y Watanuki | 6 | 6 | | | | | | | | | | | | | | |