# 2015 Rakuten Japan Open Tennis Championships – Singles

Kei Nishikori was the defending champion, but lost to Benoît Paire in the semifinals.
Stan Wawrinka won the title, defeating Paire in the final, 6–2, 6–4.

## Seeds

* Stan Wawrinka (champion)
* Kei Nishikori (semifinals)
* Gilles Simon (quarterfinals)
* Richard Gasquet (first round)
* Kevin Anderson (first round)
* Marin Čilić (quarterfinals)
* Feliciano López (first round)
* Grigor Dimitrov (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 | Semifinals | Final | Final | Final | Final |
| 1 | Stan Wawrinka | 6 | 7$^7$ | | | | | |
| | Gilles Müller | 4 | 6$^5$ | | | | | |
| | Gilles Müller | 4 | 6$^5$ | | 1 | Stan Wawrinka | 6 | 6 |
| | | | | | | Benoît Paire | 2 | 4 |
| | Benoît Paire | 1 | 6 | 6 | | Benoît Paire | 2 | 4 |
| 2 | Kei Nishikori | 6 | 4 | 2 | | | | |

### 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 | S Wawrinka | 7 | 6 | | | | | | | | | | | | | | |
| PR | R Štěpánek | 5 | 3 | | 1 | S Wawrinka | 6 | 2 | 6 | | | | | | | | |
| WC | Y Nishioka | 6 | 0 | 5 | WC | T Ito | 3 | 6 | 4 | | | | | | | | |
| WC | T Ito | 3 | 6 | 7 | | | | | | 1 | S Wawrinka | 6 | 6 | | | | |
| Q | M Ebden | 7 | 6$^4$ | 6$^5$ | | | | | | Q | A Krajicek | 3 | 4 | | | | |
| Q | A Krajicek | 5 | 7$^7$ | 7$^7$ | Q | A Krajicek | 2 | 6 | 6 | | | | | | | | |
| | J Sousa | 6 | 4 | 6 | | J Sousa | 6 | 4 | 3 | | | | | | | | |
| 7 | F López | 4 | 6 | 1 | | | | | | | | | | 1 | S Wawrinka | 6 | 7$^7$ |
| 3 | G Simon | 6 | 6 | | | | | | | | | | | | G Müller | 4 | 6$^5$ |
| Q | M Youzhny | 4 | 4 | | 3 | G Simon | 6 | 6 | | | | | | | | | |
| | J Veselý | 6 | 6 | | | J Veselý | 4 | 2 | | | | | | | | | |
| WC | Y Uchiyama | 4 | 4 | | | | | | | 3 | G Simon | 3 | 4 | | | | |
| | J Chardy | 6 | 2 | | | | | | | | G Müller | 6 | 6 | | | | |
| | S Groth | 3 | 0$^r$ | | | J Chardy | 6$^3$ | 6$^5$ | | | | | | | | | |
| | G Müller | 6 | 6 | | | G Müller | 7$^7$ | 7$^7$ | | | | | | | | | |
| 5 | K Anderson | 2 | 3 | | | | | | | | | | | | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 8 | G Dimitrov | 4 | 6 | 1 | | | | | | | | | | | | | | | |
| | B Paire | 6 | 3 | 6 | | B Paire | 6 | 2 | 7 | | | | | | | | | | |
| | M Baghdatis | 7 | 6 | | | M Baghdatis | 3 | 6 | 5 | | | | | | | | | | |
| | F Verdasco | 5 | 1 | | | | | | | | B Paire | 3 | 6 | 6 | | | | | |
| | A Ramos-Viñolas | 7$^7$ | 3 | 3 | | | | | | | N Kyrgios | 6 | 4 | 1 | | | | | |
| | N Kyrgios | 6$^3$ | 6 | 6 | | N Kyrgios | 6 | 6 | | | | | | | | | | | |
| | R Bautista Agut | 6 | 6 | | | R Bautista Agut | 4 | 2 | | | | | | | | | | | |
| 4 | R Gasquet | 4 | 1 | | | | | | | | | | | | | B Paire | 1 | 6 | 6 |
| 6 | M Čilić | 7 | 5 | 6 | | | | | | | | | | | 2 | K Nishikori | 6 | 4 | 2 |
| Q | D Young | 5 | 7 | 4 | 6 | M Čilić | 6 | 6 | | | | | | | | | | | |
| | B Tomic | 3 | 1$^r$ | | | S Johnson | 3 | 3 | | | | | | | | | | | |
| | S Johnson | 6 | 2 | | | | | | | 6 | M Čilić | 6 | 5 | 3 | | | | | |
| | A Dolgopolov | 6$^5$ | 4 | | | | | | | 2 | K Nishikori | 3 | 7 | 6 | | | | | |
| | S Querrey | 7$^7$ | 6 | | | S Querrey | 6$^3$ | 3 | | | | | | | | | | | |
| | B Ćorić | 6 | 1 | 2 | 2 | K Nishikori | 7$^7$ | 6 | | | | | | | | | | | |
| 2 | K Nishikori | 2 | 6 | 6 | | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Donald Young (qualified)
* Nicolas Mahut (qualifying competition)
* Mikhail Youzhny (qualified)
* Nikoloz Basilashvili (first round)
* Pierre-Hugues Herbert (qualifying competition)
* Go Soeda (qualifying competition)
* Austin Krajicek (qualified)
* Yūichi Sugita (first round)

### Qualifiers

* Donald Young
* Austin Krajicek
* Mikhail Youzhny
* Matthew Ebden

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Donald Young | 6 | 7$^7$ | | | | | |
| | Michał Przysiężny | 1 | 6$^1$ | | | | | |
| | Michał Przysiężny | 1 | 6$^1$ | | 1 | Donald Young | 6 | 6 |
| | | | | | | Hiroki Moriya | 1 | 4 |
| | Hiroki Moriya | 6 | 2 | 7$^7$ | | Hiroki Moriya | 1 | 4 |
| 8 | Yūichi Sugita | 2 | 6 | 6$^1$ | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Nicolas Mahut | 6 | 4 | 6 | | | | |
| | Chen Ti | 3 | 6 | 0 | | | | |
| | Chen Ti | 3 | 6 | 0 | 2 | Nicolas Mahut | 4 | 4 |
| | | | | | 7 | Austin Krajicek | 6 | 6 |
| WC | Shuichi Sekiguchi | 2 | 4 | | 7 | Austin Krajicek | 6 | 6 |
| 7 | Austin Krajicek | 6 | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Mikhail Youzhny | 7$^7$ | 6 | | | | | |
| | Jarkko Nieminen | 6$^3$ | 3 | | | | | |
| | Jarkko Nieminen | 6$^3$ | 3 | | 3 | Mikhail Youzhny | 7$^9$ | 6 |
| | | | | | 5 | Pierre-Hugues Herbert | 6$^7$ | 4 |
| WC | Hiroyasu Ehara | 1 | 6 | 5 | 5 | Pierre-Hugues Herbert | 6$^7$ | 4 |
| 5 | Pierre-Hugues Herbert | 6 | 1 | 7 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Nikoloz Basilashvili | 6$^5$ | 0 | | | | | |
| | Matthew Ebden | 7$^7$ | 6 | | | | | |
| | Matthew Ebden | 7$^7$ | 6 | | Matthew Ebden | 6 | 4 | 6 |
| | | | | 6 | Go Soeda | 3 | 6 | 3 |
| WC | Takuto Niki | 3 | 6$^3$ | 6 | Go Soeda | 3 | 6 | 3 |
| 6 | Go Soeda | 6 | 7$^7$ | | | | | |