# 2023 Open de Rennes – Singles

Ugo Humbert was the defending champion but chose not to defend his title.
Maxime Cressy won the title after Benjamin Bonzi retired trailing 3–6, 0–2 in the final.

## Seeds

* Richard Gasquet (quarterfinals)
* Grégoire Barrère (semifinals)
* Quentin Halys (first round)
* Corentin Moutet (second round)
* Constant Lestienne (first round)
* Radu Albot (quarterfinals)
* Liam Broady (first round)
* Benjamin Bonzi (final, retired)

## 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 |
| 8 | Benjamin Bonzi | 6 | 6 | | | | |
| Q | Matteo Martineau | 4 | 4 | | | | |
| Q | Matteo Martineau | 4 | 4 | 8 | Benjamin Bonzi | 3 | 0$^r$ |
| | | | | | Maxime Cressy | 6 | 2 |
| | Maxime Cressy | 7$^7$ | 7$^7$ | | Maxime Cressy | 6 | 2 |
| 2 | Grégoire Barrère | 6$^3$ | 6$^4$ | | | | |

### 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 |
| 1 | R Gasquet | 7 | 6 | | | | | | | | | | | | | | |
| | Jules Marie | 5 | 3 | | 1 | R Gasquet | 6 | 7 | | | | | | | | | |
| | L Nardi | 4 | 6 | 1 | Alt | M Guinard | 3 | 5 | | | | | | | | | |
| Alt | M Guinard | 6 | 3 | 6 | | | | | | 1 | R Gasquet | 6$^5$ | 0 | | | | |
| | G Onclin | 6 | 6 | | | | | | | 8 | B Bonzi | 7$^7$ | 6 | | | | |
| | G Zeppieri | 2 | 2 | | | G Onclin | 1 | 2 | | | | | | | | | |
| Q | Maxence Beaugé | 6$^3$ | 1 | | 8 | B Bonzi | 6 | 6 | | | | | | | | | |
| 8 | B Bonzi | 7$^7$ | 6 | | | | | | | | | | | 8 | B Bonzi | 6 | 6 |
| 3 | Q Halys | 7$^7$ | 4 | 3 | | | | | | | | | | Q | M Martineau | 4 | 4 |
| | A Escoffier | 6$^5$ | 6 | 6 | | A Escoffier | 5 | 7$^{10}$ | 2 | | | | | | | | |
| Alt | A Shelbayh | 0 | 1 | | Q | M Martineau | 7 | 6$^8$ | 6 | | | | | | | | |
| Q | M Martineau | 6 | 6 | | | | | | | Q | M Martineau | 2 | | | | | |
| | T Droguet | 6 | 2 | 6 | | | | | | PR | L Pouille | 2$^r$ | | | | | |
| WC | D Added | 1 | 6 | 4 | | T Droguet | 4 | 2 | | | | | | | | | |
| PR | L Pouille | 6 | 3 | 6 | PR | L Pouille | 6 | 6 | | | | | | | | | |
| 5 | C Lestienne | 2 | 6 | 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 |
| 7 | L Broady | 4 | 4 | | | | | | | | | | | | | | |
| | Z Bergs | 6 | 6 | | | Z Bergs | 5 | 3 | | | | | | | | | |
| | M Neuchrist | 4 | 2 | | | M Bellucci | 7 | 6 | | | | | | | | | |
| | M Bellucci | 6 | 6 | | | | | | | | M Bellucci | 6$^2$ | 5 | | | | |
| | M Cressy | 7$^7$ | 7$^7$ | | | | | | | | M Cressy | 7$^7$ | 7 | | | | |
| | Em Nava | 6$^2$ | 6$^4$ | | | M Cressy | 7$^7$ | 6 | | | | | | | | | |
| LL | E Coulibaly | 4 | 1 | | 4/WC | C Moutet | 6$^1$ | 2 | | | | | | | | | |
| 4/WC | C Moutet | 6 | 6 | | | | | | | | | | | | M Cressy | 7$^7$ | 7$^7$ |
| 6 | R Albot | 6 | 6 | | | | | | | | | | | 2 | G Barrère | 6$^3$ | 6$^4$ |
| | M Lajal | 1 | 2 | | 6 | R Albot | 6 | 7$^7$ | | | | | | | | | |
| Q | G Debru | 3 | 3 | | WC | L Poullain | 3 | 6$^2$ | | | | | | | | | |
| WC | Lucas Poullain | 6 | 6 | | | | | | | 6 | R Albot | 2 | 2 | | | | |
| Q | A Moro Cañas | 2 | 6 | 7 | | | | | | 2 | G Barrère | 6 | 6 | | | | |
| Q | A Vatutin | 6 | 1 | 5 | Q | A Moro Cañas | 3 | 6 | 3 | | | | | | | | |
| Q | K Żuk | 3 | 1 | | 2 | G Barrère | 6 | 4 | 6 | | | | | | | | |
| 2 | G Barrère | 6 | 6 | | | | | | | | | | | | | | |