# 2015 Open de Nice Côte d'Azur – Singles

Ernests Gulbis was the defending champion, but lost to Dominic Thiem in the quarterfinals. Thiem went on to win his first ATP title, defeating Leonardo Mayer in the final, 6–7$^{(8–10)}$, 7–5, 7–6$^{(7–2)}$.

## Seeds

The top four seeds receive a bye into the second round.
* Gilles Simon (withdrew)
* John Isner (semifinals)
* Ernests Gulbis (quarterfinals)
* Leonardo Mayer (final)
* Bernard Tomic (first round, retired due to a virus)
* Nick Kyrgios (second round, retired due to an elbow injury)
* Jack Sock (first round)
* Juan Mónaco (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 | Final | Final | Final | Final | Final |
| | Borna Ćorić | 4 | 3 | | | | | |
| 4 | Leonardo Mayer | 6 | 6 | | | | | |
| 4 | Leonardo Mayer | 6 | 6 | 4 | Leonardo Mayer | 7$^{10}$ | 5 | 6$^2$ |
| | | | | | Dominic Thiem | 6$^8$ | 7 | 7$^7$ |
| | Dominic Thiem | 7$^7$ | 6 | | Dominic Thiem | 6$^8$ | 7 | 7$^7$ |
| 2 | John Isner | 6$^5$ | 3 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | LL | Q Halys | 6$^0$ | 6$^5$ | | | | | | | | |
| LL | F Tiafoe | 7$^7$ | 5 | 2 | | J Duckworth | 7$^7$ | 7$^7$ | | | | | | | | |
| | J Duckworth | 6$^5$ | 7 | 6 | | | | | | J Duckworth | 3 | 6$^3$ | | | | |
| | B Ćorić | 7 | 6 | | | | | | | B Ćorić | 6 | 7$^7$ | | | | |
| Q | S Groth | 5 | 3 | | | B Ćorić | 7$^7$ | 6 | | | | | | | | |
| Q | G Mina | 6 | 0 | | Q | G Mina | 6$^4$ | 3 | | | | | | | | |
| 5 | B Tomic | 2 | 0$^r$ | | | | | | | | | | | B Ćorić | 4 | 3 |
| | | | | | | | | | | | | | 4 | L Mayer | 6 | 6 |
| | | | | | 4 | L Mayer | 6 | 6 | | | | | | | | |
| WC | L Pouille | 6 | 6 | | WC | L Pouille | 4 | 0 | | | | | | | | |
| | T Smyczek | 3 | 0 | | | | | | 4 | L Mayer | 6 | 6 | | | | |
| | S Querrey | 6 | 6 | | | | | | 8 | J Mónaco | 3 | 4 | | | | |
| Q | R Bemelmans | 2 | 3 | | | S Querrey | 3 | 1 | | | | | | | | |
| | B Paire | 4 | 2 | | 8 | J Mónaco | 6 | 6 | | | | | | | | |
| 8 | J Mónaco | 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 | Semifinals |
| 6 | N Kyrgios | 7$^7$ | 6 | | | | | | | | | | | | | | |
| | M Kukushkin | 6$^5$ | 2 | | 6 | N Kyrgios | 3$^r$ | | | | | | | | | | |
| | V Estrella Burgos | 6$^5$ | 2 | | | D Thiem | 4 | | | | | | | | | | |
| | D Thiem | 7$^7$ | 6 | | | | | | | | D Thiem | 6 | 6 | | | | |
| | A Dolgopolov | 3 | 7 | 6 | | | | | | 3 | E Gulbis | 2 | 4 | | | | |
| | S Stakhovsky | 6 | 5 | 2 | | A Dolgopolov | 5 | 6 | 1 | | | | | | | | |
| | | | | | 3 | E Gulbis | 7 | 4 | 6 | | | | | | | | |
| | | | | | | | | | | | | | | | D Thiem | 7$^7$ | 6 |
| 7 | J Sock | 7 | 5 | 1 | | | | | | | | | | 2 | J Isner | 6$^5$ | 3 |
| | D Lajović | 5 | 7 | 6 | | D Lajović | 6 | 4 | 7 | | | | | | | | |
| | P Carreño Busta | 6 | 6 | | | P Carreño Busta | 3 | 6 | 5 | | | | | | | | |
| WC | M Hamou | 2 | 2 | | | | | | | | D Lajović | 6$^3$ | 4 | | | | |
| | S Johnson | 7 | 6 | | | | | | | 2 | J Isner | 7$^7$ | 6 | | | | |
| Q | M Venus | 5 | 3 | | | S Johnson | 6$^3$ | 6 | 3 | | | | | | | | |
| | | | | | 2 | J Isner | 7$^7$ | 4 | 6 | | | | | | | | |

## Qualifying
### Seeds

* Sam Groth (qualified)
* Ruben Bemelmans (qualified)
* Gianni Mina (qualified)
* Ante Pavić (qualifying competition)
* Frances Tiafoe (qualifying competition, lucky loser)
* Quentin Halys (qualifying competition, withdrew, lucky loser)
* Fabrice Martin (second round)
* Bastian Trinker (second round)

### Qualifiers

* Sam Groth
* Ruben Bemelmans
* Gianni Mina
* Michael Venus

### Lucky losers

* Frances Tiafoe
* Quentin Halys

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | 1 | Sam Groth | 7$^7$ | 6 | | | |
| | Maxime Teixeira | 6 | 6 | | Maxime Teixeira | 6$^3$ | 2 | | | |
| WC | Alexandre Massa | 3 | 3 | | | | | 1 | Sam Groth | w/o |
| | Guillermo Durán | w/o | | | | | | 6 | Quentin Halys | |
| WC | Alexander Bublik | | | | Guillermo Durán | 4 | 6$^3$ | | | |
| | | | | 6 | Quentin Halys | 6 | 7$^7$ | | | |

#### Second qualifier

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | 2 | Ruben Bemelmans | 7$^9$ | 6$^0$ | 7 | | | | |
| | Marcus Daniell | 0 | 2 | | Yannik Reuter | 6$^7$ | 7$^7$ | 5 | | | | |
| | Yannik Reuter | 6 | 6 | | | | | | 2 | Ruben Bemelmans | 6 | 6 |
| WC | Gabriel Petit | 2 | 4 | | | | | | 5 | Frances Tiafoe | 3 | 3 |
| | Daniil Medvedev | 6 | 6 | | Daniil Medvedev | 3 | 2 | | | | | |
| | | | | 5 | Frances Tiafoe | 6 | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | 3 | Gianni Mina | 2 | 6 | 6 | | | | | |
| André Sá | 0 | 1 | | | Mate Pavić | 6 | 3 | 3 | | | | | |
| Mate Pavić | 6 | 6 | | | | | | | 3 | Gianni Mina | 4 | 6 | 6 |
| Wang Chieh-fu | 1 | 7$^7$ | 2 | | | | | | | Philipp Davydenko | 6 | 4 | 3 |
| Philipp Davydenko | 6 | 6$^5$ | 6 | | Philipp Davydenko | 7$^9$ | 7$^7$ | | | | | | |
| | | | | 8 | Bastian Trinker | 6$^7$ | 6$^5$ | | | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| | | | | | 4 | Ante Pavić | 6 | 6 | | | | | |
| WC | Louis Tessa | 3 | 4 | | | Eric Butorac | 2 | 2 | | | | | |
| | Eric Butorac | 6 | 6 | | | | | | 4 | Ante Pavić | 6 | 6$^5$ | 4 |
| | Michael Venus | 6 | 3 | 6 | | | | | | Michael Venus | 3 | 7$^7$ | 6 |
| | Gianluca Mager | 4 | 6 | 3 | | Michael Venus | 6 | 7 | | | | | |
| | | | | | 7 | Fabrice Martin | 3 | 5 | | | | | |