# 2018 Open Harmonie mutuelle – Singles

Egor Gerasimov was the defending champion but lost in the second round to Jürgen Zopp.
Ričardas Berankis won the title after defeating Constant Lestienne 6–2, 5–7, 6–4 in the final.

## Seeds

* Marcos Baghdatis (semifinals)
* Ričardas Berankis (champion)
* Lukáš Lacko (first round)
* Sergiy Stakhovsky (first round)
* Oscar Otte (first round)
* Elias Ymer (second round)
* Corentin Moutet (first round)
* Jürgen Zopp (semifinals)

## 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 | Final |
| 1 | Marcos Baghdatis | 5 | 1 | | | | | |
| Q | Constant Lestienne | 7 | 6 | | | | | |
| Q | Constant Lestienne | 7 | 6 | Q | Constant Lestienne | 2 | 7 | 4 |
| | | | | 2 | Ričardas Berankis | 6 | 5 | 6 |
| 8 | Jürgen Zopp | 3 | 3 | 2 | Ričardas Berankis | 6 | 5 | 6 |
| 2 | Ričardas Berankis | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | M Baghdatis | 6 | 6 | | | | | | | | | | | | | | |
| | A Arnaboldi | 4 | 3 | | 1 | M Baghdatis | 1 | 6 | 6 | | | | | | | | |
| WC | M Guinard | 4 | 2 | | | U Ignatik | 6 | 2 | 3 | | | | | | | | |
| | U Ignatik | 6 | 6 | | | | | | | 1 | M Baghdatis | 6 | 6 | | | | |
| | G Oliveira | 1 | 2 | | | | | | | | M Bachinger | 3 | 2 | | | | |
| | M Bachinger | 6 | 6 | | | M Bachinger | 6 | 3 | 6 | | | | | | | | |
| Q | J De Loore | 6 | 6$^5$ | 2 | 6 | E Ymer | 4 | 6 | 2 | | | | | | | | |
| 6 | E Ymer | 3 | 7$^7$ | 6 | | | | | | | | | | 1 | M Baghdatis | 5 | 1 |
| 4 | S Stakhovsky | 4 | 3 | | | | | | | | | | | Q | C Lestienne | 7 | 6 |
| | T Kamke | 6 | 6 | | | T Kamke | 7$^9$ | 6 | | | | | | | | | |
| WC | A Hoang | 6 | 6$^5$ | 4 | WC | E Furness | 6$^7$ | 0 | | | | | | | | | |
| WC | E Furness | 3 | 7$^7$ | 6 | | | | | | | T Kamke | 1 | 4 | | | | |
| Q | L Grigelis | 4 | 6$^4$ | | | | | | | Q | C Lestienne | 6 | 6 | | | | |
| | S Robert | 6 | 7$^7$ | | | S Robert | 3 | 4 | | | | | | | | | |
| Q | C Lestienne | 6 | 4 | 6 | Q | C Lestienne | 6 | 6 | | | | | | | | | |
| 7 | C Moutet | 4 | 6 | 3 | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | J Zopp | 4 | 6 | 3 | | | | | | | | | | | | | |
| | V Millot | 6 | 3 | 0$^r$ | 8 | J Zopp | 6 | 6 | | | | | | | | | |
| Q | T Lamasine | 7$^7$ | 4 | 2 | | E Gerasimov | 4 | 3 | | | | | | | | | |
| | E Gerasimov | 6$^4$ | 6 | 6 | | | | | 8 | J Zopp | 2 | 6 | 6 | | | | |
| | M Safwat | 4 | 7 | 5 | | | | | | Z Kolář | 6 | 3 | 2 | | | | |
| | Z Kolář | 6 | 5 | 7 | | Z Kolář | 6 | 6 | | | | | | | | | |
| | A Šetkić | 3 | 6 | 6 | | A Šetkić | 4 | 4 | | | | | | | | | |
| 3 | L Lacko | 6 | 3 | 4 | | | | | | | | | | 8 | J Zopp | 3 | 3 |
| 5 | O Otte | 6 | 6$^8$ | 5 | | | | | | | | | | 2 | R Berankis | 6 | 6 |
| SE | G Barrère | 3 | 7$^{10}$ | 7 | SE | G Barrère | 3 | 3 | | | | | | | | | |
| | D Novak | 6 | 7$^7$ | | | D Novak | 6 | 6 | | | | | | | | | |
| | K de Schepper | 4 | 6$^4$ | | | | | | | D Novak | 6$^1$ | 6$^4$ | | | | | |
| WC | U Humbert | 4 | 3 | | | | | | 2 | R Berankis | 7$^7$ | 7$^7$ | | | | | |
| SE | M Janvier | 6 | 6 | | SE | M Janvier | 6$^5$ | 3 | | | | | | | | | |
| | K Majchrzak | 3 | 4 | | 2 | R Berankis | 7$^7$ | 6 | | | | | | | | | |
| 2 | R Berankis | 6 | 6 | | | | | | | | | | | | | | |