# 2023 Open Quimper Bretagne – Singles

Vasek Pospisil was the defending champion but lost in the first round to Gijs Brouwer.
Grégoire Barrère won the title after defeating Arthur Fils 6–1, 6–4 in the final.

## Seeds

* Quentin Halys (withdrew)
* Grégoire Barrère (champion)
* Vasek Pospisil (first round)
* Radu Albot (quarterfinals)
* Dominic Stricker (quarterfinals, retired)
* Dennis Novak (second round)
* Matteo Arnaldi (first round)
* Luca Van Assche (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 | Final | Final | Final | Final |
| Q | Calvin Hemery | 5 | 2 | | | | |
| WC | Arthur Fils | 7 | 6 | | | | |
| WC | Arthur Fils | 7 | 6 | WC | Arthur Fils | 1 | 4 |
| | | | | 2 | Grégoire Barrère | 6 | 6 |
| | Geoffrey Blancaneaux | 4 | 3 | 2 | Grégoire Barrère | 6 | 6 |
| 2 | Grégoire Barrère | 6 | 6 | | | | |

### 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 |
| LL | E Furness | 3 | 6 | 6 | | | | | | | | | | | | | | |
| Q | J Tatlot | 6 | 4 | 3 | LL | E Furness | 3 | 4 | | | | | | | | | | |
| Q | C Hemery | 6 | 5 | 7 | Q | C Hemery | 6 | 6 | | | | | | | | | | |
| | H Grenier | 4 | 7 | 5 | | | | | | Q | C Hemery | 6 | 2 | | | | | |
| | B Paire | 1 | 4 | | | | | | | 5 | D Stricker | 3 | 0$^r$ | | | | | |
| Q | I Marchenko | 6 | 6 | | Q | I Marchenko | 6 | 3 | 3 | | | | | | | | | |
| WC | P-H Herbert | 2 | 3 | | 5 | D Stricker | 2 | 6 | 6 | | | | | | | | | |
| 5 | D Stricker | 6 | 6 | | | | | | | | | | | | Q | C Hemery | 5 | 2 |
| 3 | V Pospisil | 6 | 3 | 3 | | | | | | | | | | | WC | A Fils | 7 | 6 |
| | G Brouwer | 3 | 6 | 6 | | G Brouwer | 6 | 4 | 2 | | | | | | | | | |
| Q | Y Bu | 3 | 2 | | WC | A Fils | 4 | 6 | 6 | | | | | | | | | |
| WC | A Fils | 6 | 6 | | | | | | | WC | A Fils | 4 | 6 | 6 | | | | |
| | O Virtanen | 6 | 6 | | | | | | | | O Virtanen | 6 | 2 | 3 | | | | |
| Q | G Mpetshi Perricard | 4 | 2 | | | O Virtanen | 5 | | | | | | | | | | | |
| Alt | S Ofner | 3 | 6 | 6 | Alt | S Ofner | 2$^r$ | | | | | | | | | | | |
| 7 | M Arnaldi | 6 | 2 | 1 | | | | | | | | | | | | | | |

### 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 |
| 8 | L Van Assche | 6 | 6 | | | | | | | | | | | | | | |
| | L Nardi | 4 | 3 | | 8 | L Van Assche | 6 | 2 | 0 | | | | | | | | |
| Alt | S Rodríguez Taverna | 1 | 6 | 6$^5$ | | G Blancaneaux | 4 | 6 | 6 | | | | | | | | |
| | G Blancaneaux | 6 | 3 | 7$^7$ | | | | | | | G Blancaneaux | 6 | 7$^7$ | | | | |
| | A Bellier | 7$^8$ | 7$^7$ | | | | | | | 4 | R Albot | 4 | 6$^5$ | | | | |
| | Z Piros | 6$^6$ | 6$^1$ | | | A Bellier | 6$^4$ | 3 | | | | | | | | | |
| | A Müller | 4 | 2 | | 4 | R Albot | 7$^7$ | 6 | | | | | | | | | |
| 4 | R Albot | 6 | 6 | | | | | | | | | | | | G Blancaneaux | 4 | 3 |
| 6 | D Novak | 6 | 6 | | | | | | | | | | | 2 | G Barrère | 6 | 6 |
| LL | N Hardt | 1 | 2 | | 6 | D Novak | 3 | 3 | | | | | | | | | |
| WC | L Pouille | 6 | 6 | | WC | L Pouille | 6 | 6 | | | | | | | | | |
| | F Cobolli | 3 | 4 | | | | | | | WC | L Pouille | 3 | 3 | | | | |
| Q | N Moreno de Alboran | 7 | 6 | | | | | | | 2 | G Barrère | 6 | 6 | | | | |
| | M Guinard | 5 | 2 | | Q | N Moreno de Alboran | 6$^5$ | 4 | | | | | | | | | |
| | Em Nava | 7$^7$ | 2 | 6$^5$ | 2 | G Barrère | 7$^7$ | 6 | | | | | | | | | |
| 2 | G Barrère | 6$^5$ | 6 | 7$^7$ | | | | | | | | | | | | | |