| Singles | |
|---|---|
| 2023 Split Open | |
| Champion |  Zsombor Piros |
| Runner-up |  Norbert Gombos |
| Score | 7–6(7–2), 7–6(11–9) |
Christopher O'Connell was the defending champion [1] 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.
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)| Semifinals | Final | ||||||||||||
| 1 | Christopher O'Connell | 2 | 4 | ||||||||||
| Zsombor Piros | 6 | 6 | |||||||||||
| Zsombor Piros | 77 | 711 | |||||||||||
| 3 | Norbert Gombos | 62 | 69 | ||||||||||
| 3 | Norbert Gombos | 6 | 6 | ||||||||||
| PR | Marc Polmans | 2 | 4 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | C O'Connell | 77 | 6 | ||||||||||||||||||||||||
| Q | D Sweeny | 65 | 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 | 77 | ||||||||||||||||||||||
| Alt | H Mayot | 2 | 6 | 2 | SE | S Mochizuki | 4 | 61 | |||||||||||||||||||
| SE | S Mochizuki | 6 | 1 | 6 | Z Piros | 77 | 5 | 6 | |||||||||||||||||||
| G Debru | 6 | 2 | 4 | Q |  R Albot | 65 | 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 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | L Klein | 6 | 3 | 65 | |||||||||||||||||||||||
| M Valkusz | 3 | 6 | 77 | M Valkusz | 6 | 1 | 6 | ||||||||||||||||||||
| F Maestrelli | 77 | 6 | F Maestrelli | 2 | 6 | 2 | |||||||||||||||||||||
 H Međedović | 63 | 1 | M Valkusz | 610 | 3 | ||||||||||||||||||||||
| Q |  K Żuk | 6 | 710 | 3 | N Gombos | 712 | 6 | ||||||||||||||||||||
| M Navone | 4 | 68 | Q | K Żuk | 3 | 6 | 66 | ||||||||||||||||||||
| F Cobolli | 1 | 6 | 1 | 3 | N Gombos | 6 | 3 | 78 | |||||||||||||||||||
| 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 | 78 | 77 | ||||||||||||||||||||
 K Coppejans | 6 | 3 | 3 | Q |  E Ymer | 6 | 66 | 61 | |||||||||||||||||||
| Q | E Ymer | 3 | 6 | 6 | 6 | F Misolic | 3 | 3 | |||||||||||||||||||
| WC | D Ajduković | 63 | 6 | 6 | PR | M Polmans | 6 | 6 | |||||||||||||||||||
| WC |  K Ivanovski | 77 | 1 | 1 | WC | D Ajduković | 65 | 65 | |||||||||||||||||||
| PR | M Polmans | 6 | 4 | 6 | PR | M Polmans | 77 | 77 | |||||||||||||||||||
| 2 | J Rodionov | 4 | 6 | 3 | |||||||||||||||||||||||
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Alexander Zverev was the defending champion, but chose not to participate this year.
Jo-Wilfried Tsonga was the defending champion, but withdrew before the tournament began.
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Mats Moraing was the defending champion but chose not to defend his title.
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Alexander Shevchenko was the defending champion but lost in the first round to Jakub Menšík.