# 2023 Brest Challenger – Singles

Grégoire Barrère was the defending champion but chose not to defend his title.
Pedro Martínez won the title after defeating Benjamin Bonzi 7–6$^{(8–6)}$, 7–6$^{(7–1)}$ in the final.

## Seeds

* Richard Gasquet (first round)
* Nuno Borges (second round)
* Jaume Munar (first round)
* Benjamin Bonzi (final)
* Constant Lestienne (semifinals)
* Hugo Gaston (semifinals)
* Liam Broady (second round)
* David Goffin (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 |
| 6 | Hugo Gaston | 6 | 2 | 4 | | | | |
| 4 | Benjamin Bonzi | 3 | 6 | 6 | | | | |
| 4 | Benjamin Bonzi | 3 | 6 | 6 | 4 | Benjamin Bonzi | 6$^6$ | 6$^1$ |
| | | | | | | Pedro Martínez | 7$^8$ | 7$^7$ |
| | Pedro Martínez | 6 | 7 | | | Pedro Martínez | 7$^8$ | 7$^7$ |
| 5 | Constant Lestienne | 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/WC | R Gasquet | 1 | 4 | | | | | | | | | | | | | | | |
| | B Nakashima | 6 | 6 | | | B Nakashima | 2 | 6 | 5 | | | | | | | | | |
| | A Cazaux | 6 | 6 | | | A Cazaux | 6 | 3 | 7 | | | | | | | | | |
| SE | D Novak | 3 | 4 | | | | | | | | A Cazaux | 2 | 2 | | | | | |
| | G Zeppieri | 6 | 3 | | | | | | | 6 | H Gaston | 6 | 6 | | | | | |
| | A Escoffier | 3 | 1$^r$ | | | G Zeppieri | 6$^6$ | 3 | | | | | | | | | | |
| LL | G Blancaneaux | 0 | 4 | | 6 | H Gaston | 7$^8$ | 6 | | | | | | | | | | |
| 6 | H Gaston | 6 | 6 | | | | | | | | | | | 6 | H Gaston | 6 | 2 | 4 |
| 4 | B Bonzi | 6 | 7 | | | | | | | | | | | 4 | B Bonzi | 3 | 6 | 6 |
| | P Llamas Ruiz | 3 | 5 | | 4 | B Bonzi | 4 | 7$^8$ | 6 | | | | | | | | | |
| WC | G Mpetshi Perricard | 7$^7$ | 6$^5$ | 4 | Q | C Hemery | 6 | 6$^2$ | 2 | | | | | | | | | |
| Q | C Hemery | 6$^2$ | 7$^7$ | 6 | | | | | | 4 | B Bonzi | 6 | 6 | | | | | |
| Q | R Peniston | 2 | 4 | | | | | | | Q | A Fery | 3 | 4 | | | | | |
| Q | A Fery | 6 | 6 | | Q | A Fery | 6 | 6$^5$ | 6 | | | | | | | | | |
| LL | G Brouwer | 6$^2$ | 7 | 6$^3$ | 8 | D Goffin | 1 | 7$^7$ | 3 | | | | | | | | | |
| 8 | D Goffin | 7$^7$ | 5 | 7$^7$ | | | | | | | | | | | | | | |

### 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 |
| 7 | L Broady | 6 | 6 | | | | | | | | | | | | | | |
| | L Nardi | 3 | 2 | | 7 | L Broady | 2 | 6 | 6$^4$ | | | | | | | | |
| | Z Piros | 2 | 6 | 6 | | Z Piros | 6 | 4 | 7$^7$ | | | | | | | | |
| Q | D Ajduković | 6 | 2 | 4 | | | | | | | Z Piros | 3 | 6$^7$ | | | | |
| | R Albot | 6$^4$ | 6 | 6 | | | | | | | P Martínez | 6 | 7$^9$ | | | | |
| Q | G Diallo | 7$^7$ | 2 | 3 | | R Albot | 6$^2$ | 7$^{13}$ | | | | | | | | | |
| | P Martínez | 7 | 1 | 6 | | P Martínez | 7$^7$ | 7$^{15}$ | | | | | | | | | |
| 3 | J Munar | 5 | 6 | 4 | | | | | | | | | | | P Martínez | 6 | 7 |
| 5 | C Lestienne | 6 | 3 | 6 | | | | | | | | | | 5 | C Lestienne | 4 | 5 |
| | O Virtanen | 2 | 6 | 3 | 5 | C Lestienne | 6 | 2 | | | | | | | | | |
| | C Moutet | 4 | 6$^5$ | | | B Paire | 2 | 0$^r$ | | | | | | | | | |
| | B Paire | 6 | 7$^7$ | | | | | | | 5 | C Lestienne | 6 | 6 | | | | |
| Q | M Martineau | 6 | 4 | 3 | | | | | | WC | T Droguet | 3 | 2 | | | | |
| WC | T Droguet | 4 | 6 | 6 | WC | T Droguet | 7 | 6 | | | | | | | | | |
| LL | F Ferreira Silva | 3 | 3 | | 2 | N Borges | 5 | 3 | | | | | | | | | |
| 2 | N Borges | 6 | 6 | | | | | | | | | | | | | | |