# 2025 Open Quimper Bretagne – Singles

Pierre-Hugues Herbert was the defending champion but lost in the final to Sascha Gueymard Wayenburg.
Gueymard Wayenburg won the title after defeating Herbert 6–7$^{(3–7)}$, 6–1, 6–2 in the final.

## Seeds

* Adrian Mannarino (first round)
* Thiago Seyboth Wild (first round)
* Borna Ćorić (first round)
* Otto Virtanen (first round)
* Mattia Bellucci (first round)
* Aleksandar Kovacevic (second round)
* Mikhail Kukushkin (second round)
* Laslo Djere (quarterfinals)

## 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 |
| Q | Sascha Gueymard Wayenburg | 7$^7$ | 3 | 6 | | | | | |
| Alt | Matteo Martineau | 6$^5$ | 6 | 3 | | | | | |
| Alt | Matteo Martineau | 6$^5$ | 6 | 3 | Q | Sascha Gueymard Wayenburg | 6$^3$ | 6 | 6 |
| | | | | | | Pierre-Hugues Herbert | 7$^7$ | 1 | 2 |
| Q | Ričardas Berankis | 3 | 6 | 3 | | Pierre-Hugues Herbert | 7$^7$ | 1 | 2 |
| | Pierre-Hugues Herbert | 6 | 3 | 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 | Semifinals |
| 1/WC | A Mannarino | 6 | 4 | 4 | | | | | | | | | | | | | | | |
| | M McDonald | 3 | 6 | 6 | | M McDonald | 3 | 6$^2$ | | | | | | | | | | | |
| Q | M Brunold | 6 | 3 | 3 | Q | S Gueymard Wayenburg | 6 | 7$^7$ | | | | | | | | | | | |
| Q | S Gueymard Wayenburg | 0 | 6 | 6 | | | | | | Q | S Gueymard Wayenburg | 7$^8$ | 6$^3$ | 7 | | | | | |
| | G Brouwer | 5 | 4 | | | | | | | 8 | L Djere | 6$^6$ | 7$^7$ | 5 | | | | | |
| Q | K Jacquet | 7 | 6 | | Q | K Jacquet | 7$^7$ | 4 | 4 | | | | | | | | | | |
| WC | A Géa | 4 | 2 | | 8 | L Djere | 6$^2$ | 6 | 6 | | | | | | | | | | |
| 8 | L Djere | 6 | 6 | | | | | | | | | | | | Q | S Gueymard Wayenburg | 7$^7$ | 3 | 6 |
| 4 | O Virtanen | 1 | 6 | 3 | | | | | | | | | | | Alt | M Martineau | 6$^5$ | 6 | 3 |
| Q | V Sachko | 6 | 3 | 6 | Q | V Sachko | 6 | 6$^6$ | 6 | | | | | | | | | | |
| WC | B Paire | 6 | 1 | 7$^7$ | WC | B Paire | 3 | 7$^8$ | 3 | | | | | | | | | | |
| | H Mayot | 2 | 6 | 6$^4$ | | | | | | Q | V Sachko | 5 | 4 | | | | | | |
| Alt | M Martineau | 6 | 7$^8$ | | | | | | | Alt | M Martineau | 7 | 6 | | | | | | |
| | J Kym | 3 | 6$^6$ | | Alt | M Martineau | 7$^7$ | 7$^7$ | | | | | | | | | | | |
| | A Kachmazov | 5 | 2 | | 6 | A Kovacevic | 6$^2$ | 6$^3$ | | | | | | | | | | | |
| 6 | A Kovacevic | 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | M Bellucci | 6$^5$ | 5 | | | | | | | | | | | | | | | |
| | C Lestienne | 7$^7$ | 7 | | | C Lestienne | 4 | 4 | | | | | | | | | | |
| | E Møller | 6 | 7 | | | E Møller | 6 | 6 | | | | | | | | | | |
| Q | S Kozlov | 3 | 5 | | | | | | | | E Møller | 5 | 4 | | | | | |
| | T Atmane | 6$^2$ | 6 | 2 | | | | | | Q | R Berankis | 7 | 6 | | | | | |
| | G Barrère | 7$^7$ | 4 | 6 | | G Barrère | 2 | 2 | | | | | | | | | | |
| Q | R Berankis | 7$^8$ | 6 | | Q | R Berankis | 6 | 6 | | | | | | | | | | |
| 3 | B Ćorić | 6$^6$ | 3 | | | | | | | | | | | Q | R Berankis | 3 | 6 | 3 |
| 7 | M Kukushkin | 6$^3$ | 6 | 6 | | | | | | | | | | | P-H Herbert | 6 | 3 | 6 |
| | J Kovalík | 7$^7$ | 3 | 4 | 7 | M Kukushkin | 3 | 3 | | | | | | | | | | |
| | T Droguet | 6 | 7 | | | T Droguet | 6 | 6 | | | | | | | | | | |
| | A Holmgren | 4 | 5 | | | | | | | | T Droguet | 6$^2$ | 2 | | | | | |
| | P-H Herbert | 6 | 6 | | | | | | | | P-H Herbert | 7$^7$ | 6 | | | | | |
| | C Hemery | 3 | 4 | | | P-H Herbert | 7 | 3 | 6 | | | | | | | | | |
| Alt | U Blanchet | 6 | 7$^9$ | | Alt | U Blanchet | 5 | 6 | 3 | | | | | | | | | |
| 2 | T Seyboth Wild | 4 | 6$^7$ | | | | | | | | | | | | | | | |