Japan Open 2018
Daniil Medvedev won the title, beating Kei Nishikori 6–2 6–4 in the final.
Main draw 32 players
- 1🇭🇷Marin Cilic#97Round of 32 · Lost to Jan-Lennard Struff
- 2🇿🇦Kevin AndersonQuarterfinals · Lost to Richard Gasquet
- 3🇯🇵Kei NishikoriFinal · Lost to Daniil Medvedev
- 4🇦🇷Diego SchwartzmanRound of 32 · Lost to Daniil Medvedev
- 5🇬🇷Stefanos Tsitsipas#36Quarterfinals · Lost to Kei Nishikori
- 6🇨🇦Milos RaonicQuarterfinals · Lost to Daniil Medvedev
- 7🇰🇷Hyeon ChungRound of 32 · Lost to Denis Shapovalov
- 8🇫🇷Richard GasquetSemifinals · Lost to Kei Nishikori
- Q🇷🇺Daniil Medvedev#5Final · Champion
- 🇨🇦Denis Shapovalov#50Semifinals · Lost to Daniil Medvedev
- 🇩🇪Jan-Lennard Struff#37Quarterfinals · Lost to Denis Shapovalov
- 🇦🇺Alex de Minaur#9Round of 16 · Lost to Stefanos Tsitsipas
- 🇫🇷Benoit PaireRound of 16 · Lost to Kei Nishikori
- 🇺🇸Frances Tiafoe#8Round of 16 · Lost to Kevin Anderson
- 🇫🇷Jeremy ChardyRound of 16 · Lost to Jan-Lennard Struff
- Q🇸🇰Martin KlizanRound of 16 · Lost to Daniil Medvedev
- 🇦🇺Nick KyrgiosRound of 16 · Lost to Richard Gasquet
- 🇨🇭Stan Wawrinka#164Round of 16 · Lost to Denis Shapovalov
- Q🇯🇵Yosuke Watanuki#237Round of 16 · Lost to Milos Raonic
- 🇫🇷Adrian Mannarino#61Round of 32 · Lost to Milos Raonic
- 🇧🇦Damir Dzumhur#90Round of 32 · Lost to Jeremy Chardy
- Q🇺🇸Denis KudlaRound of 32 · Lost to Richard Gasquet
- 🇫🇷Gilles SimonRound of 32 · Lost to Alex de Minaur
- 🇦🇺Matthew EbdenRound of 32 · Lost to Kevin Anderson
- 🇩🇪Maximilian MartererRound of 32 · Lost to Frances Tiafoe
- 🇨🇱Nicolas JarryRound of 32 · Lost to Benoit Paire
- 🇳🇱Robin HaaseRound of 32 · Lost to Yosuke Watanuki
- 🇺🇸Steve Johnson#426Round of 32 · Lost to Martin Klizan
- WC🇯🇵Taro Daniel#172Round of 32 · Lost to Stefanos Tsitsipas
- SE🇺🇸Taylor Fritz#10Round of 32 · Lost to Stan Wawrinka
- WC🇯🇵Yoshihito NishiokaRound of 32 · Lost to Nick Kyrgios
- WC🇯🇵Yuichi SugitaRound of 32 · Lost to Kei Nishikori