| Singles | |
|---|---|
| 2018 Rakuten Japan Open Tennis Championships | |
| Champion |  Daniil Medvedev |
| Runner-up |  Kei Nishikori |
| Score | 6–2, 6–4 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
David Goffin was the defending champion, but withdrew before the competition began.
Daniil Medvedev won the title, defeating Kei Nishikori in the final, 6–2, 6–4.
Marin Čilić (first round)
Kevin Anderson (quarterfinals) Kei Nishikori (final)
Diego Schwartzman (first round)
Stefanos Tsitsipas (quarterfinals)
Milos Raonic (quarterfinals)
Chung Hyeon (first round)
Richard Gasquet (semifinals)| Semifinals | Final | ||||||||||||
| Denis Shapovalov | 3 | 3 | |||||||||||
| Q | Daniil Medvedev | 6 | 6 | ||||||||||
| Q | Daniil Medvedev | 6 | 6 | ||||||||||
| 3 | Kei Nishikori | 2 | 4 | ||||||||||
| 3 | Kei Nishikori | 77 | 6 | ||||||||||
| 8 | Richard Gasquet | 62 | 1 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Čilić | 6 | 4 | 61 | |||||||||||||||||||||||
 J-L Struff | 3 | 6 | 77 | J-L Struff | 77 | 62 | 6 | ||||||||||||||||||||
| J Chardy | 4 | 6 | 6 | J Chardy | 63 | 77 | 4 | ||||||||||||||||||||
 D Džumhur | 6 | 3 | 3 | J-L Struff | 6 | 67 | 4 | ||||||||||||||||||||
 S Wawrinka | 6 | 6 | D Shapovalov | 4 | 79 | 6 | |||||||||||||||||||||
| SE |  T Fritz | 3 | 4 | S Wawrinka | 6 | 1 | 4 | ||||||||||||||||||||
| D Shapovalov | 6 | 3 | 6 | D Shapovalov | 4 | 6 | 6 | ||||||||||||||||||||
| 7 | H Chung | 3 | 6 | 2 | D Shapovalov | 3 | 3 | ||||||||||||||||||||
| 4 | D Schwartzman | 4 | 4 | Q | D Medvedev | 6 | 6 | ||||||||||||||||||||
| Q | D Medvedev | 6 | 6 | Q | D Medvedev | 6 | 6 | ||||||||||||||||||||
| Q |  M Kližan | 6 | 77 | Q | M Kližan | 4 | 3 | ||||||||||||||||||||
| S Johnson | 4 | 64 | Q | D Medvedev | 77 | 6 | |||||||||||||||||||||
| Q | Y Watanuki | 67 | 6 | 6 | 6 | M Raonic | 64 | 3 | |||||||||||||||||||
 R Haase | 79 | 4 | 1 | Q | Y Watanuki | 3 | 62 | ||||||||||||||||||||
| A Mannarino | 3 | 4 | 6 | M Raonic | 6 | 77 | |||||||||||||||||||||
| 6 | M Raonic | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | S Tsitsipas | 6 | 6 | ||||||||||||||||||||||||
| WC | T Daniel | 1 | 3 | 5 | S Tsitsipas | 6 | 5 | 6 | |||||||||||||||||||
| G Simon | 77 | 65 | 2 |  A de Minaur | 3 | 7 | 1 | ||||||||||||||||||||
| A de Minaur | 61 | 77 | 6 | 5 | S Tsitsipas | 3 | 3 | ||||||||||||||||||||
| B Paire | 6 | 77 | 3 | K Nishikori | 6 | 6 | |||||||||||||||||||||
 N Jarry | 4 | 61 | B Paire | 3 | 5 | ||||||||||||||||||||||
| WC | Y Sugita | 4 | 1 | 3 | K Nishikori | 6 | 7 | ||||||||||||||||||||
| 3 | K Nishikori | 6 | 6 | 3 | K Nishikori | 77 | 6 | ||||||||||||||||||||
| 8 | R Gasquet | 710 | 6 | 8 | R Gasquet | 62 | 1 | ||||||||||||||||||||
| Q | D Kudla | 68 | 3 | 8 | R Gasquet | 77 | 77 | ||||||||||||||||||||
| N Kyrgios | 7 | 77 | N Kyrgios | 64 | 61 | ||||||||||||||||||||||
| WC | Y Nishioka | 5 | 63 | 8 | R Gasquet | 78 | 77 | ||||||||||||||||||||
| M Marterer | 5 | 4 | 2 | K Anderson | 66 | 64 | |||||||||||||||||||||
| F Tiafoe | 7 | 6 | F Tiafoe | 3 | 6 | 2 | |||||||||||||||||||||
| M Ebden | 6 | 61 | 2 | 2 | K Anderson | 6 | 3 | 6 | |||||||||||||||||||
| 2 | K Anderson | 4 | 77 | 6 | |||||||||||||||||||||||
Daniil Medvedev (qualified) Martin Kližan (qualified) Denis Kudla (qualified) Mackenzie McDonald (first round)
Marius Copil (first round) Bradley Klahn (qualifying competition)
Hubert Hurkacz (first round) Tim Smyczek (first round)| First round | Qualifying competition | ||||||||||||
| 1 | Daniil Medvedev | 6 | 6 | ||||||||||
| Alt | Hiroki Moriya | 3 | 3 | ||||||||||
| 1 | Daniil Medvedev | 64 | 6 | 6 | |||||||||
| PR |  Egor Gerasimov | 77 | 3 | 3 | |||||||||
| PR | Egor Gerasimov | 6 | 6 | ||||||||||
| 5 | Marius Copil | 4 | 3 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Martin Kližan | 6 | 6 | ||||||||||
 Prajnesh Gunneswaran | 4 | 2 | |||||||||||
| 2 | Martin Kližan | 6 | 6 | ||||||||||
| 6 | Bradley Klahn | 3 | 4 | ||||||||||
 Ruben Bemelmans | 6 | 3 | 64 | ||||||||||
| 6 | Bradley Klahn | 2 | 6 | 77 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Denis Kudla | 6 | 3 | 6 | |||||||||
| Horacio Zeballos | 2 | 6 | 4 | ||||||||||
| 3 | Denis Kudla | 6 | 1 | 6 | |||||||||
| WC | Yasutaka Uchiyama | 3 | 6 | 3 | |||||||||
| WC | Yasutaka Uchiyama | 6 | 6 | ||||||||||
| 7 | Hubert Hurkacz | 2 | 2 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Mackenzie McDonald | 4 | 6 | 3 | |||||||||
| WC | Tatsuma Ito | 6 | 1 | 6 | |||||||||
| WC | Tatsuma Ito | 2 | 4 | ||||||||||
| WC | Yosuke Watanuki | 6 | 6 | ||||||||||
| WC | Yosuke Watanuki | 6 | 6 | ||||||||||
| 8 | Tim Smyczek | 4 | 2 | ||||||||||
Jürgen Melzer was the defending champion, but lost in the first round to Igor Sijsling.
Kei Nishikori won the title, defeating Feliciano López in the final, 6–2, 6–3.
Juan Martín del Potro was the defending champion and successfully defended his title, defeating Roger Federer in the final, 7–6(7–3), 2–6, 6–4.
Kei Nishikori was the defending champion and successfully defended his title, defeating Ivo Karlović in the final, 6–4, 7–6(7–0).
Kei Nishikori was the two-time defending champion and successfully defended his title, defeating Kevin Anderson 6–4, 6–4 in the final.
Rafael Nadal was the defending champion, but chose not to participate this year.
Jo-Wilfried Tsonga was the defending champion, but withdrew before the tournament began with a left hamstring injury.
Novak Djokovic defeated Roger Federer in the final, 6–4, 6–4 to win the men's singles tennis title at the 2018 Cincinnati Masters. With the win, he became the first player to complete the career Golden Masters in singles.
Damir Džumhur was the defending champion, but lost in the quarterfinals to Stan Wawrinka.
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 through October 7, 2018. Unseeded Daniil Medvedev, who entered the main draw as a qualifier, won the singles title.
Novak Djokovic defeated Borna Ćorić in the final, 6–3, 6–4 to win the singles tennis title at the 2018 Shanghai Masters. It was his record fourth Shanghai Masters title, and 32nd Masters 1000 title overall. He did not lose a single set and did not have his serve broken throughout the entire tournament.
Lucas Pouille was the defending champion but lost to Borna Ćorić in the second round.
Mirza Bašić was the defending champion but lost in the first round to Martin Kližan.
Roger Federer was the defending champion, but chose not to participate this year.
Fabio Fognini defeated Dušan Lajović in the final, 6–3, 6–4 to win the singles tennis title at the 2019 Monte-Carlo Masters. It was his first ATP Tour Masters 1000 title.
Novak Djokovic defeated Stefanos Tsitsipas in the final, 6–3, 6–4 to win the men's singles tennis title at the 2019 Madrid Open. With the win, Djokovic tied Rafael Nadal's record of 33 Masters 1000 singles titles. He did not lose a single set in the entire tournament.
Defending champion Rafael Nadal defeated Novak Djokovic in the final, 6–0, 4–6, 6–1 to win the men's singles tennis title at the 2019 Italian Open. It was his record-extending ninth Italian Open title and record 34th ATP Masters 1000 title.
Defending champion Rafael Nadal defeated Daniil Medvedev in the final, 6–3, 6–0 to win the men's singles tennis title at the 2019 Canadian Open. It was the first time Nadal successfully defended a hard court title.
Daniil Medvedev defeated David Goffin in the final, 7–6(7–3), 6–4 to win the men's singles tennis title at the 2019 Cincinnati Masters. It was his first ATP Tour Masters 1000 title.
Jannik Sinner defeated Vasek Pospisil in the final, 6–4, 3–6, 7–6(7–3) to win the singles tennis title at the 2020 Sofia Open. It was his first ATP Tour title.
Stefanos Tsitsipas defeated Roberto Bautista Agut in the final, 6–4, 3–6, 7–6(7–2) to win the men's singles tennis title at the 2022 Mallorca Championships.