2018 Rakuten Japan Open Tennis Championships
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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 |
|
The 2018 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on indoor hard courts. It was the 45th edition of the Japan Open, and part of the 500 Series of the 2018 ATP World Tour. It was held at the Musashino Forest Sport Plaza in Tokyo, Japan, from October 1–7, 2018.
Contents
Points and prize money
Point distribution
| 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 | N/A | 45 | 25 | 0 |
Prize money
| 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 | N/A | N/A | N/A |
Singles main-draw entrants
Seeds
| 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 |
- 1 Rankings are as of September 24, 2018.
Other entrants
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:
Withdrawals
- Before the tournament
David Goffin → replaced by 
Matthew Ebden- Lucas Pouille → replaced by Jan-Lennard Struff
Doubles main-draw entrants
Seeds
| 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 |
- Rankings are as of September 24, 2018.
Other entrants
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
Champions
Singles
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- Daniil Medvedev def. Kei Nishikori 6–2, 6–4
Doubles
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- Ben McLachlan / Jan-Lennard Struff def. Raven Klaasen / Michael Venus 6–4, 7–5
