# 2018 Open BNP Paribas Banque de Bretagne – Singles

Adrian Mannarino was the defending champion but chose not to defend his title.
Quentin Halys won the title after defeating Alexey Vatutin 6–3, 7–6$^{(7–1)}$ in the final.

## Seeds

* Stefanos Tsitsipas (semifinals)
* Mikhail Youzhny (withdrew)
* Mirza Bašić (second round)
* Dustin Brown (second round)
* Quentin Halys (champion)
* Martin Kližan (second round)
* Uladzimir Ignatik (second round)
* Yannick Maden (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 |
| 1/WC | Stefanos Tsitsipas | 6 | 4 | 6$^4$ | | | | |
| 5 | Quentin Halys | 1 | 6 | 7$^7$ | | | | |
| 5 | Quentin Halys | 1 | 6 | 7$^7$ | 5 | Quentin Halys | 6 | 7$^7$ |
| | | | | | | Alexey Vatutin | 3 | 6$^1$ |
| | Alexey Vatutin | 6 | 7$^7$ | | | Alexey Vatutin | 3 | 6$^1$ |
| | Calvin Hemery | 4 | 6$^5$ | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1/WC | S Tsitsipas | 6 | 6 | | | | | | | | | | | | | | | | |
| | A Šetkić | 3 | 4 | | 1/WC | S Tsitsipas | 6 | 5 | 6 | | | | | | | | | | |
| SE | A Hoang | 6 | 6 | | SE | A Hoang | 4 | 7 | 4 | | | | | | | | | | |
| | J Kovalík | 3 | 4 | | | | | | | 1/WC | S Tsitsipas | 4 | 7$^{10}$ | 6 | | | | | |
| | C Taberner | 4 | 1 | | | | | | | | S Napolitano | 6 | 6$^8$ | 4 | | | | | |
| | S Napolitano | 6 | 6 | | | S Napolitano | 3 | 7$^{10}$ | 6 | | | | | | | | | | |
| WC | E Furness | 4 | 6 | 3 | 8 | Y Maden | 6 | 6$^8$ | 2 | | | | | | | | | | |
| 8 | Y Maden | 6 | 4 | 6 | | | | | | | | | | | 1/WC | S Tsitsipas | 6 | 4 | 6$^4$ |
| 4 | D Brown | 6 | 6 | | | | | | | | | | | | 5 | Q Halys | 1 | 6 | 7$^7$ |
| Alt | J Clarke | 4 | 4 | | 4 | D Brown | 3 | 7$^7$ | 2 | | | | | | | | | | |
| Q | M Janvier | 3 | 6 | 6 | Q | M Janvier | 6 | 6$^4$ | 6 | | | | | | | | | | |
| LL | Jeremy Jahn | 6 | 1 | 4 | | | | | | Q | M Janvier | 6$^4$ | 2 | | | | | | |
| | A De Greef | 2 | 4 | | | | | | | 5 | Q Halys | 7$^7$ | 6 | | | | | | |
| | V Millot | 6 | 6 | | | V Millot | 2 | 1 | | | | | | | | | | | |
| | M Bourgue | 3 | 4 | | 5 | Q Halys | 6 | 6 | | | | | | | | | | | |
| 5 | Q Halys | 6 | 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 |
| 6 | M Kližan | 6$^5$ | 6 | 6 | | | | | | | | | | | | |
| Q | D Guez | 7$^7$ | 2 | 4 | 6 | M Kližan | 6 | 4 | 6$^5$ | | | | | | | |
| Q | G Barrère | 5 | 6 | 5 | LL | T Lamasine | 3 | 6 | 7$^7$ | | | | | | | |
| LL | T Lamasine | 7 | 4 | 7 | | | | | | LL | T Lamasine | 2 | 2 | | | |
| | A Vatutin | 6 | 6 | | | | | | | | A Vatutin | 6 | 6 | | | |
| WC | E Benchetrit | 1 | 1 | | | A Vatutin | 6 | 3 | 7$^8$ | | | | | | | |
| | T Gabashvili | 6 | 1 | 2$^r$ | 3 | M Bašić | 3 | 6 | 6$^6$ | | | | | | | |
| 3 | M Bašić | 4 | 6 | 5 | | | | | | | | | | A Vatutin | 6 | 7$^7$ |
| 7 | U Ignatik | 6 | 4 | 6 | | | | | | | | | | C Hemery | 4 | 6$^5$ |
| | G Sakharov | 3 | 6 | 1 | 7 | U Ignatik | 4 | 4 | | | | | | | | |
| | C Hemery | 6 | 6 | | | C Hemery | 6 | 6 | | | | | | | | |
| | A Arnaboldi | 4 | 4 | | | | | | | | C Hemery | 6 | 6 | | | |
| | R Ojeda Lara | 0 | 6 | 3 | | | | | | | J Munar | 4 | 0 | | | |
| | J Munar | 6 | 4 | 6 | | J Munar | 6$^6$ | 7$^7$ | 6 | | | | | | | |
| | M Trungelliti | 7$^7$ | 6 | | | M Trungelliti | 7$^8$ | 6$^5$ | 3 | | | | | | | |
| Q | M Donati | 6$^4$ | 1 | | | | | | | | | | | | | |