# 2015 Open Harmonie mutuelle – Singles

Andreas Beck was the defending champion, but lost in the second round.
Nicolas Mahut won the title, defeating Yūichi Sugita in the final, 3–6, 7–6$^{(7–3)}$, 6–4.

## Seeds

* Lucas Pouille (semifinals)
* Andreas Beck (second round)
* Nicolas Mahut (champion)
* Igor Sijsling (first round)
* Yūichi Sugita (final)
* Jan Hernych (second round)
* David Guez (first round)
* Edward Corrie (first 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 | Final | Final | Final | Final | Final |
| 1 | Lucas Pouille | 5 | 4 | | | | | |
| 3 | Nicolas Mahut | 7 | 6 | | | | | |
| 3 | Nicolas Mahut | 7 | 6 | 3 | Nicolas Mahut | 3 | 7$^7$ | 6 |
| | | | | 5 | Yūichi Sugita | 6 | 6$^3$ | 4 |
| Q | Constant Lestienne | 4 | 2 | 5 | Yūichi Sugita | 6 | 6$^3$ | 4 |
| 5 | Yūichi Sugita | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | L Pouille | 7 | 3 | 7$^7$ | | | | | | | | | | | | | | |
| WC | Q Halys | 5 | 6 | 6$^4$ | 1 | L Pouille | 6 | 3 | 6 | | | | | | | | | |
| | G Gigounon | 6$^4$ | 2 | | | M Michalička | 4 | 6 | 3 | | | | | | | | | |
| | M Michalička | 7$^7$ | 6 | | | | | | | 1 | L Pouille | 6 | 6 | | | | | |
| | Y Uchiyama | 1 | 3 | | | | | | | | N Mektić | 2 | 4 | | | | | |
| | N Mektić | 6 | 6 | | | N Mektić | 4 | 6 | 6 | | | | | | | | | |
| | J Mertl | 7 | 6$^2$ | 6 | | J Mertl | 6 | 3 | 4 | | | | | | | | | |
| 8 | E Corrie | 5 | 7 | 3 | | | | | | | | | | | 1 | L Pouille | 5 | 4 |
| 3 | N Mahut | 6 | 7$^7$ | | | | | | | | | | | | 3 | N Mahut | 7 | 6 |
| Q | R Becker | 4 | 6$^5$ | | 3 | N Mahut | 6 | 6 | | | | | | | | | | |
| | P Krstin | 1 | 2 | | | Y Marti | 3 | 0 | | | | | | | | | | |
| | Y Marti | 6 | 6 | | | | | | | 3 | N Mahut | 7$^7$ | 5 | 7$^7$ | | | | |
| | Jules Marie | 6 | 6 | | | | | | | | R Boutillier | 6$^2$ | 7 | 6$^5$ | | | | |
| | J Cagnina | 2 | 3 | | | J Marie | 4 | 2 | | | | | | | | | | |
| | R Boutillier | 6 | 3 | 7$^7$ | | R Boutillier | 6 | 6 | | | | | | | | | | |
| 7 | D Guez | 2 | 6 | 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 |
| 6 | J Hernych | 6 | 6 | | | | | | | | | | | | | | |
| WC | G Burquier | 4 | 4 | | 6 | J Hernych | 6 | 4 | 1 | | | | | | | | |
| Q | C Lestienne | 6 | 3 | 6 | Q | C Lestienne | 4 | 6 | 6 | | | | | | | | |
| WC | G Barrère | 2 | 6 | 3 | | | | | | Q | C Lestienne | 6 | 6 | | | | |
| | M Vaïsse | 4 | 2 | | | | | | | | V Millot | 1 | 4 | | | | |
| | V Millot | 6 | 6 | | | V Millot | 7 | 6 | | | | | | | | | |
| | U Ignatik | 2 | 6 | 6 | | U Ignatik | 5 | 1 | | | | | | | | | |
| 4 | I Sijsling | 6 | 4 | 4 | | | | | | | | | | Q | C Lestienne | 4 | 2 |
| 5 | Y Sugita | 6 | 3 | | | | | | | | | | | 5 | Y Sugita | 6 | 6 |
| Q | M Willis | 4 | 0$^r$ | | 5 | Y Sugita | 6 | 6 | | | | | | | | | |
| Q | H Nys | 4 | 5 | | | Y Mertens | 0 | 3 | | | | | | | | | |
| | Y Mertens | 6 | 7 | | | | | | | 5 | Y Sugita | 5 | | | | | |
| | F Nielsen | 3 | 6$^5$ | | | | | | | | J Huta Galung | 3$^r$ | | | | | |
| | J Huta Galung | 6 | 7$^7$ | | | J Huta Galung | 6 | 6 | | | | | | | | | |
| WC | Laurent Rochette | 1 | 7$^7$ | 5 | 2 | A Beck | 3 | 4 | | | | | | | | | |
| 2 | A Beck | 6 | 6$^2$ | 7 | | | | | | | | | | | | | |