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| 2018 Rakuten Japan Open Tennis Championships | ||||
|---|---|---|---|---|
| Date | 1–7 October | |||
| Edition | 45th | |||
| Category | ATP World Tour 500 | |||
| Draw | 32S/16D | |||
| Surface | Hard / indoor | |||
| Location | Tokyo, Japan | |||
| Venue | Musashino Forest Sport Plaza | |||
| Champions | ||||
| Singles | ||||
 Daniil Medvedev | ||||
| Doubles | ||||
 Ben McLachlan / Jan-Lennard Struff | ||||
| ||||
The2018 Rakuten Japan Open Tennis Championships was a men'stennis tournament played on indoorhard courts. It was the 45th edition of theJapan Open, and part of the500 Series of the2018 ATP World Tour. It was held at theMusashino Forest Sport Plaza in Tokyo, Japan, from October 1 through October 7, 2018. UnseededDaniil Medvedev, who entered the main draw as a qualifier, won the singles title.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q | Q2 | Q1 |
| Singles[1] | 500 | 300 | 180 | 90 | 45 | 0 | 20 | 10 | 0 |
|---|---|---|---|---|---|---|---|---|---|
| Doubles[1] | 0 | — | 45 | 25 | 0 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | $384,120 | $188,315 | $94,755 | $48,195 | $25,025 | $13,200 | $2,920 | $1,490 |
|---|---|---|---|---|---|---|---|---|
| Doubles | $115,650 | $65,620 | $28,400 | $14,580 | $7,540 | — | — | — |
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 CRO | Marin Čilić | 5 | 1 |
 RSA | Kevin Anderson | 9 | 2 |
| JPN | Kei Nishikori | 12 | 3 |
 ARG | Diego Schwartzman | 14 | 4 |
 GRE | Stefanos Tsitsipas | 15 | 5 |
 CAN | Milos Raonic | 20 | 6 |
 KOR | Chung Hyeon | 23 | 7 |
 FRA | Richard Gasquet | 25 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry as a special exempt:
The following players received entry from the qualifying draw:
David Goffin → replaced by
Matthew EbdenLucas Pouille → replaced byJan-Lennard Struff| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
 FIN | Henri Kontinen | AUS | John Peers | 15 | 1 |
 GBR | Jamie Murray |  BRA | Bruno Soares | 23 | 2 |
| RSA | Raven Klaasen |  NZL | Michael Venus | 34 | 3 |
| JPN | Ben McLachlan | GER | Jan-Lennard Struff | 50 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
Daniil Medvedev defeatedKei Nishikori 6–2, 6–4Ben McLachlan /Jan-Lennard Struff defeatedRaven Klaasen /Michael Venus 6–4, 7–5
