# 2023 Slovak Open – Men's singles

Márton Fucsovics was the defending champion but chose not to defend his title.
Gabriel Diallo won the title after defeating Joris De Loore 6–0, 7–5 in the final.

## Seeds

* Dominic Thiem (second round)
* Dominic Stricker (first round)
* Benjamin Bonzi (first round)
* Tomáš Macháč (withdrew)
* Liam Broady (first round)
* Zsombor Piros (second round)
* Maxime Cressy (quarterfinals)
* Alex Molčan (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 |
| | Gabriel Diallo | 7$^7$ | 6 | | | |
| Q | Martin Damm | 6$^5$ | 2 | | | |
| Q | Martin Damm | 6$^5$ | 2 | Gabriel Diallo | 6 | 7 |
| | | | | Joris De Loore | 0 | 5 |
| | Joris De Loore | 7 | 7$^7$ | Joris De Loore | 0 | 5 |
| | Luca Nardi | 5 | 6$^5$ | | | |

### 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 | D Thiem | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| | V Sachko | 6$^5$ | 3 | | 1 | D Thiem | 1 | 6 | 6$^5$ | | | | | | | | | |
| | G Diallo | 7 | 6 | | | G Diallo | 6 | 4 | 7$^7$ | | | | | | | | | |
| SE | A Fery | 5 | 1 | | | | | | | | G Diallo | 3 | 7$^7$ | 6 | | | | |
| | D Prižmić | 0 | 3 | | | | | | | | L Klein | 6 | 6$^5$ | 2 | | | | |
| | L Klein | 6 | 6 | | | L Klein | 6 | 6 | | | | | | | | | | |
| | O Virtanen | 7$^7$ | 1 | 6 | | O Virtanen | 4 | 4 | | | | | | | | | | |
| 5 | L Broady | 6$^5$ | 6 | 2 | | | | | | | | | | | | G Diallo | 7$^7$ | 6 |
| LL | A Santillan | 3 | 6 | 3 | | | | | | | | | | | Q | M Damm | 6$^5$ | 2 |
| Q | M Damm | 6 | 3 | 6 | Q | M Damm | 6 | 6 | | | | | | | | | | |
| Q | K Ivanovski | 7$^7$ | 6 | | Q | K Ivanovski | 3 | 4 | | | | | | | | | | |
| Q | P Gojowczyk | 6$^3$ | 2 | | | | | | | Q | M Damm | 6 | 7$^8$ | | | | | |
| LL | M Martineau | 4 | 6 | 6 | | | | | | 7 | M Cressy | 4 | 6$^6$ | | | | | |
| | J Menšík | 6 | 4 | 1 | LL | M Martineau | 6$^4$ | 3 | | | | | | | | | | |
| WC | Lukáš Pokorný | 6$^4$ | 3 | | 7 | M Cressy | 7$^7$ | 6 | | | | | | | | | | |
| 7 | M Cressy | 7$^7$ | 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 |
| 8 | A Molčan | 7 | 4 | 3 | | | | | | | | | | | | | |
| | J De Loore | 5 | 6 | 6 | | J De Loore | 6 | 6 | | | | | | | | | |
| SE | B Hassan | 6 | 6 | | SE | B Hassan | 3 | 4 | | | | | | | | | |
| | S Travaglia | 3 | 2 | | | | | | | | J De Loore | 6 | 3 | 7$^7$ | | | |
| Q | D Novak | 6$^6$ | 0 | | | | | | | Q | I Marchenko | 3 | 6 | 6$^2$ | | | |
| Q | I Marchenko | 7$^8$ | 6 | | Q | I Marchenko | 4 | 6 | 7 | | | | | | | | |
| WC | N Gombos | 6 | 7$^7$ | | WC | N Gombos | 6 | 3 | 5 | | | | | | | | |
| 3 | B Bonzi | 4 | 6$^5$ | | | | | | | | | | | | J De Loore | 7 | 7$^7$ |
| 6 | Z Piros | 7 | 3 | 6 | | | | | | | | | | | L Nardi | 5 | 6$^5$ |
| | F Misolic | 5 | 6 | 3 | 6 | Z Piros | 3 | 1 | | | | | | | | | |
| | G Zeppieri | 2 | 0 | | | D Džumhur | 6 | 6 | | | | | | | | | |
| | D Džumhur | 6 | 6 | | | | | | | | D Džumhur | 3 | 0 | | | | |
| WC | A Paulson | 6 | 6 | | | | | | | | L Nardi | 6 | 6 | | | | |
| Q | GA Boitan | 4 | 3 | | WC | A Paulson | 7 | 4 | 3 | | | | | | | | |
| | L Nardi | 7$^7$ | 6 | | | L Nardi | 5 | 6 | 6 | | | | | | | | |
| 2 | D Stricker | 6$^4$ | 3 | | | | | | | | | | | | | | |