# 2023 Split Open – Singles

Christopher O'Connell was the defending champion but lost in the semifinals to Zsombor Piros.
Piros won the title after defeating Norbert Gombos 7–6$^{(7–2)}$, 7–6$^{(11–9)}$ in the final.

## Seeds

* Christopher O'Connell (semifinals)
* Jurij Rodionov (first round)
* Norbert Gombos (final)
* Fábián Marozsán (first round)
* Lukáš Klein (first round)
* Filip Misolic (quarterfinals)
* Mattia Bellucci (first round)
* Kaichi Uchida (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 | 2 | 4 | | | | |
| | Zsombor Piros | 6 | 6 | | | | |
| | Zsombor Piros | 6 | 6 | | Zsombor Piros | 7$^7$ | 7$^{11}$ |
| | | | | 3 | Norbert Gombos | 6$^2$ | 6$^9$ |
| 3 | Norbert Gombos | 6 | 6 | 3 | Norbert Gombos | 6$^2$ | 6$^9$ |
| PR | Marc Polmans | 2 | 4 | | | | |

### 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 | C O'Connell | 7$^7$ | 6 | | | | | | | | | | | | | | |
| Q | D Sweeny | 6$^5$ | 2 | | 1 | C O'Connell | 6 | 6 | | | | | | | | | |
| | E Furness | 3 | 5 | | Q | N Fatić | 1 | 3 | | | | | | | | | |
| Q | N Fatić | 6 | 7 | | | | | | 1 | C O'Connell | 6 | 7 | | | | | |
| | S Rodríguez Taverna | 6 | 3 | 4 | | | | | WC | D Prižmić | 2 | 5 | | | | | |
| WC | D Prižmić | 4 | 6 | 6 | WC | D Prižmić | 7 | 6 | | | | | | | | | |
| Q | A Cazaux | 6 | 7 | | Q | A Cazaux | 5 | 2 | | | | | | | | | |
| 7 | M Bellucci | 3 | 5 | | | | | | | | | | | 1 | C O'Connell | 2 | 4 |
| 4 | F Marozsán | 3 | 3 | | | | | | | | | | | | Z Piros | 6 | 6 |
| | Z Piros | 6 | 6 | | | Z Piros | 6 | 7$^7$ | | | | | | | | | |
| Alt | H Mayot | 2 | 6 | 2 | SE | S Mochizuki | 4 | 6$^1$ | | | | | | | | | |
| SE | S Mochizuki | 6 | 1 | 6 | | | | | | Z Piros | 7$^7$ | 5 | 6 | | | | |
| | G Debru | 6 | 2 | 4 | | | | | Q | R Albot | 6$^5$ | 7 | 3 | | | | |
| | M Guinard | 4 | 6 | 6 | | M Guinard | 5 | 3 | | | | | | | | | |
| Q | R Albot | 6 | 7 | | Q | R Albot | 7 | 6 | | | | | | | | | |
| 8 | K Uchida | 1 | 5 | | | | | | | | | | | | | | |

### 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 |
| 5 | L Klein | 6 | 3 | 6$^5$ | | | | | | | | | | | | | |
| | M Valkusz | 3 | 6 | 7$^7$ | | M Valkusz | 6 | 1 | 6 | | | | | | | | |
| | F Maestrelli | 7$^7$ | 6 | | | F Maestrelli | 2 | 6 | 2 | | | | | | | | |
| | H Međedović | 6$^3$ | 1 | | | | | | | | M Valkusz | 6$^{10}$ | 3 | | | | |
| Q | K Żuk | 6 | 7$^{10}$ | | | | | | | 3 | N Gombos | 7$^{12}$ | 6 | | | | |
| | M Navone | 4 | 6$^8$ | | Q | K Żuk | 3 | 6 | 6$^6$ | | | | | | | | |
| | F Cobolli | 1 | 6 | 1 | 3 | N Gombos | 6 | 3 | 7$^8$ | | | | | | | | |
| 3 | N Gombos | 6 | 3 | 6 | | | | | | | | | | 3 | N Gombos | 6 | 6 |
| 6 | F Misolic | 6 | 6 | | | | | | | | | | | PR | M Polmans | 2 | 4 |
| | ND Ionel | 3 | 3 | | 6 | F Misolic | 4 | 7$^8$ | 7$^7$ | | | | | | | | |
| | K Coppejans | 6 | 3 | 3 | Q | E Ymer | 6 | 6$^6$ | 6$^1$ | | | | | | | | |
| Q | E Ymer | 3 | 6 | 6 | | | | | | 6 | F Misolic | 3 | 3 | | | | |
| WC | D Ajduković | 6$^3$ | 6 | 6 | | | | | | PR | M Polmans | 6 | 6 | | | | |
| WC | K Ivanovski | 7$^7$ | 1 | 1 | WC | D Ajduković | 6$^5$ | 6$^5$ | | | | | | | | | |
| PR | M Polmans | 6 | 4 | 6 | PR | M Polmans | 7$^7$ | 7$^7$ | | | | | | | | | |
| 2 | J Rodionov | 4 | 6 | 3 | | | | | | | | | | | | | |