# 2023 Iași Open – Men's singles

Felipe Meligeni Alves was the defending champion but chose not to defend his title.
Hugo Gaston won the title after defeating Bernabé Zapata Miralles 3–6, 6–0, 6–4 in the final.

## Seeds

* Bernabé Zapata Miralles (final)
* Radu Albot (first round)
* Tomáš Macháč (first round, retired)
* Zsombor Piros (first round)
* Cristian Garín (semifinals)
* Hugo Gaston (champion)
* Enzo Couacaud (first round)
* Zdeněk Kolář (second 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 | Semifinals | Final | Final | Final | Final | Final |
| 1/WC | Bernabé Zapata Miralles | 2 | 7 | 6 | | | | | |
| 5 | Cristian Garín | 6 | 5 | 3 | | | | | |
| 5 | Cristian Garín | 6 | 5 | 3 | 1/WC | Bernabé Zapata Miralles | 6 | 0 | 4 |
| | | | | | 6 | Hugo Gaston | 3 | 6 | 6 |
| 6 | Hugo Gaston | 6 | 6 | | 6 | Hugo Gaston | 3 | 6 | 6 |
| Alt | Steven Diez | 4 | 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 | Semifinals |
| 1/WC | B Zapata Miralles | 6 | 6 | | | | | | | | | | | | | | | |
| | A Dougaz | 4 | 3 | | 1/WC | B Zapata Miralles | 6 | 6 | | | | | | | | | | |
| | D Svrčina | 7$^7$ | 6 | | | D Svrčina | 3 | 4 | | | | | | | | | | |
| Q | Sebastian Gima | 6$^3$ | 2 | | | | | | 1/WC | B Zapata Miralles | 6 | 3 | 6 | | | | | |
| | J Menšík | 7 | 6 | | | | | | | J Menšík | 1 | 6 | 2 | | | | | |
| Q | K Jacquet | 5 | 4 | | | J Menšík | 6 | 6 | | | | | | | | | | |
| Q | Andrey Chepelev | 4 | 6 | 5 | 8 | Z Kolář | 2 | 2 | | | | | | | | | | |
| 8 | Z Kolář | 6 | 3 | 7 | | | | | | | | | | 1/WC | B Zapata Miralles | 2 | 7 | 6 |
| 4 | Z Piros | 2 | 6 | 6$^2$ | | | | | | | | | | 5 | C Garín | 6 | 5 | 3 |
| | T Atmane | 6 | 3 | 7$^7$ | | T Atmane | 1 | 5 | | | | | | | | | | |
| | Edoardo Lavagno | 4 | 3 | | | R Bonadio | 6 | 7 | | | | | | | | | | |
| | R Bonadio | 6 | 6 | | | | | | | R Bonadio | 4 | 6 | 6$^3$ | | | | | |
| Alt | V Vacherot | 7$^7$ | 7 | | | | | | 5 | C Garín | 6 | 4 | 7$^7$ | | | | | |
| | J De Loore | 6$^4$ | 5 | | Alt | V Vacherot | 6$^2$ | 2 | | | | | | | | | | |
| | DN Mădăraș | 5 | 2 | | 5 | C Garín | 7$^7$ | 6 | | | | | | | | | | |
| 5 | C Garín | 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 | Semifinals |
| 6 | H Gaston | 4 | 0 | | | | | | | | | | | | | | | |
| Alt | M Zekić | 6 | 1$^r$ | | 6 | H Gaston | 7$^7$ | 6 | | | | | | | | | | |
| PR | P Cuevas | 6 | 6 | | PR | P Cuevas | 6$^5$ | 1 | | | | | | | | | | |
| | G Onclin | 2 | 3 | | | | | | | 6 | H Gaston | 6 | 3 | 6 | | | | |
| LL | M Vrbenský | 6 | 6 | | | | | | | | V Sachko | 0 | 6 | 3 | | | | |
| Q | Juan Bautista Otegui | 2 | 3 | | LL | M Vrbenský | 1 | 2 | | | | | | | | | | |
| | V Sachko | 6$^5$ | 6 | 3 | | V Sachko | 6 | 6 | | | | | | | | | | |
| 3 | T Macháč | 7$^7$ | 4 | 0$^r$ | | | | | | | | | | | 6 | H Gaston | 6 | 6 |
| 7 | E Couacaud | 2 | 1 | | | | | | | | | | | | Alt | S Diez | 4 | 4 |
| WC | FC Jianu | 6 | 6 | | WC | FC Jianu | 6 | 4 | 3 | | | | | | | | | |
| Q | K Ivanovski | 4 | 7$^7$ | 6 | Q | K Ivanovski | 3 | 6 | 6 | | | | | | | | | |
| | ND Ionel | 6 | 6$^4$ | 2 | | | | | | Q | K Ivanovski | 4 | 3 | | | | | |
| Q | Àlex Martí Pujolràs | 1 | 1 | | | | | | | Alt | S Diez | 6 | 6 | | | | | |
| Alt | S Diez | 6 | 6 | | Alt | S Diez | 6 | 6 | | | | | | | | | | |
| | JP Ficovich | 6 | 6 | | | JP Ficovich | 3 | 4 | | | | | | | | | | |
| 2 | R Albot | 3 | 3 | | | | | | | | | | | | | | | |