# 2023 Bratislava Open – Singles

Alexander Shevchenko was the defending champion but lost in the first round to Jakub Menšík.
Vitaliy Sachko won the title after defeating Dimitar Kuzmanov 2–6, 6–2, 7–6$^{(7–2)}$ in the final.

## Seeds

* Alex Molčan (semifinals)
* Alexander Shevchenko (first round)
* Federico Coria (quarterfinals)
* Zsombor Piros (second round)
* Tomáš Macháč (quarterfinals)
* Norbert Gombos (second round)
* Lukáš Klein (first round)
* Jozef Kovalík (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 | Final |
| 1 | Alex Molčan | 0 | 1 | | | | | |
| | Dimitar Kuzmanov | 6 | 6 | | | | | |
| | Dimitar Kuzmanov | 6 | 6 | | Dimitar Kuzmanov | 6 | 2 | 6$^2$ |
| | | | | Q | Vitaliy Sachko | 2 | 6 | 7$^7$ |
| Q | Vitaliy Sachko | 6 | 7 | Q | Vitaliy Sachko | 2 | 6 | 7$^7$ |
| | Tomás Barrios Vera | 4 | 5 | | | | | |

### 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 | A Molčan | 4 | 6 | 6 | | | | | | | | | | | | | | |
| | RA Burruchaga | 6 | 2 | 3 | 1 | A Molčan | 6 | 7 | | | | | | | | | | |
| WC | Peter Benjamín Privara | 6 | 6$^4$ | 1 | | K Coppejans | 4 | 5 | | | | | | | | | | |
| | K Coppejans | 1 | 7$^7$ | 6 | | | | | | 1 | A Molčan | 7$^7$ | 3 | 6 | | | | |
| Alt | K Żuk | 6 | 5 | 2 | | | | | | 5 | T Macháč | 6$^5$ | 6 | 1 | | | | |
| | Z Kolář | 4 | 7 | 6 | | Z Kolář | 4 | 0 | | | | | | | | | | |
| | R Bonadio | 4 | 7$^8$ | 2 | 5 | T Macháč | 6 | 6 | | | | | | | | | | |
| 5 | T Macháč | 6 | 6$^6$ | 6 | | | | | | | | | | | 1 | A Molčan | 0 | 1 |
| 4 | Z Piros | 6 | 7 | | | | | | | | | | | | | D Kuzmanov | 6 | 6 |
| | S Nagal | 2 | 5 | | 4 | Z Piros | 3 | 6 | 4 | | | | | | | | | |
| Q | G Melzer | 2 | 3 | | | D Kuzmanov | 6 | 2 | 6 | | | | | | | | | |
| | D Kuzmanov | 6 | 6 | | | | | | | | D Kuzmanov | 7 | 6 | | | | | |
| Q | J Kym | 6 | 7$^7$ | | | | | | | Q | J Kym | 5 | 4 | | | | | |
| | H Laaksonen | 2 | 6$^3$ | | Q | J Kym | 6 | 6$^6$ | 7$^9$ | | | | | | | | | |
| | D Svrčina | 3 | 6 | 4 | 6 | N Gombos | 3 | 7$^8$ | 6$^7$ | | | | | | | | | |
| 6 | N Gombos | 6 | 3 | 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 |
| 8 | J Kovalík | 6$^1$ | 7 | 0 | | | | | | | | | | | | | | |
| Q | V Sachko | 7$^7$ | 5 | 6 | Q | V Sachko | 7 | 6 | | | | | | | | | | |
| | D Prižmić | 2 | 4 | | Q | I Marchenko | 5 | 1 | | | | | | | | | | |
| Q | I Marchenko | 6 | 6 | | | | | | | Q | V Sachko | 4 | 7 | 6 | | | | |
| Q | M Safwat | 2 | 7$^8$ | 6 | | | | | | 3 | F Coria | 6 | 5 | 3 | | | | |
| WC | Lukáš Pokorný | 6 | 6$^6$ | 4 | Q | M Safwat | 7$^7$ | 2 | 4 | | | | | | | | | |
| | D Michalski | 0 | 2 | | 3 | F Coria | 6$^3$ | 6 | 6 | | | | | | | | | |
| 3 | F Coria | 6 | 6 | | | | | | | | | | | | Q | V Sachko | 6 | 7 |
| 7 | L Klein | 6 | 5 | 0 | | | | | | | | | | | | T Barrios Vera | 4 | 5 |
| | T Barrios Vera | 1 | 7 | 6 | | T Barrios Vera | 5 | 6 | 6 | | | | | | | | | |
| | D Džumhur | 7$^8$ | 1 | 4 | Q | L Neumayer | 7 | 3 | 3 | | | | | | | | | |
| Q | L Neumayer | 6$^6$ | 6 | 6 | | | | | | | T Barrios Vera | 4 | 6 | 6 | | | | |
| WC | F Verdasco | 7 | 6 | | | | | | | | J Menšík | 6 | 1 | 3 | | | | |
| | C İlkel | 5 | 4 | | WC | F Verdasco | 1 | 4 | | | | | | | | | | |
| | J Menšík | 6 | 3 | 6 | | J Menšík | 6 | 6 | | | | | | | | | | |
| 2 | A Shevchenko | 4 | 6 | 1 | | | | | | | | | | | | | | |