# 2023 Japan Open Tennis Championships – Singles

Ben Shelton defeated Aslan Karatsev in the final, 7–5, 6–1 to win the singles tennis title at the 2023 Japan Open. It was his first ATP Tour title. He and his father Bryan Shelton became the fourth father-son duo in the Open Era to win tour-level singles titles.
Taylor Fritz was the defending champion, but lost in the second round to Shintaro Mochizuki.

## Seeds

* Taylor Fritz (second round)
* Casper Ruud (second round)
* Alexander Zverev (first round)
* Alex de Minaur (quarterfinals)
* Tommy Paul (quarterfinals)
* Frances Tiafoe (first round)
* Karen Khachanov (first round)
* Félix Auger-Aliassime (quarterfinals)

## 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 |
| WC | Shintaro Mochizuki | 3 | 4 | | | | |
| | Aslan Karatsev | 6 | 6 | | | | |
| | Aslan Karatsev | 6 | 6 | | Aslan Karatsev | 5 | 1 |
| | | | | | Ben Shelton | 7 | 6 |
| | Ben Shelton | 6$^2$ | 7$^7$ | 6 | Ben Shelton | 7 | 6 |
| Q | Marcos Giron | 7$^7$ | 6$^5$ | 4 | | | |

### 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | T Fritz | 6 | 6 | | | | | | | | | | | | | | | |
| | C Norrie | 4 | 3 | | 1 | T Fritz | 6 | 4 | 6$^2$ | | | | | | | | | |
| WC | S Mochizuki | 6 | 7$^7$ | | WC | S Mochizuki | 0 | 6 | 7$^7$ | | | | | | | | | |
| | TM Etcheverry | 4 | 6$^5$ | | | | | | | WC | S Mochizuki | 7 | 2 | 7 | | | | |
| WC | S Shimabukuro | 4 | 6 | 3 | | | | | | | A Popyrin | 5 | 6 | 5 | | | | |
| Q | C Garín | 6 | 3 | 6 | Q | C Garín | 6 | 6$^3$ | 2 | | | | | | | | | |
| | A Popyrin | 6 | 6 | | | A Popyrin | 4 | 7$^7$ | 6 | | | | | | | | | |
| 7 | K Khachanov | 4 | 2 | | | | | | | | | | | | WC | S Mochizuki | 3 | 4 |
| 4 | A de Minaur | 4 | 7$^7$ | 7$^7$ | | | | | | | | | | | | A Karatsev | 6 | 6 |
| Q | J Draper | 6 | 6$^4$ | 6$^1$ | 4 | A de Minaur | 6 | 7 | | | | | | | | | | |
| | F Cerúndolo | 4 | 1 | | | D Schwartzman | 0 | 5 | | | | | | | | | | |
| | D Schwartzman | 6 | 6 | | | | | | | 4 | A de Minaur | 3 | 2 | | | | | |
| | Z Zhang | 3 | 6 | 7$^7$ | | | | | | | A Karatsev | 6 | 6 | | | | | |
| | H Hurkacz | 6 | 4 | 6$^4$ | | Z Zhang | 3 | 4 | | | | | | | | | | |
| | A Karatsev | 6 | 7$^7$ | | | A Karatsev | 6 | 6 | | | | | | | | | | |
| 6 | F Tiafoe | 3 | 6$^4$ | | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | T Paul | 3 | 6 | 6 | | | | | | | | | | | | | | |
| | D Altmaier | 6 | 1 | 3 | 5 | T Paul | 6 | 6 | | | | | | | | | | |
| | M McDonald | 7 | 6 | | | M McDonald | 4 | 2 | | | | | | | | | | |
| | M Purcell | 5 | 4 | | | | | | | 5 | T Paul | 6$^4$ | 3 | | | | | |
| | B Shelton | 3 | 6 | 7$^7$ | | | | | | | B Shelton | 7$^7$ | 6 | | | | | |
| Q | T Daniel | 6 | 4 | 6$^2$ | | B Shelton | 6$^5$ | 6 | 6 | | | | | | | | | |
| | J Thompson | 6 | 6 | | | J Thompson | 7$^7$ | 4 | 3 | | | | | | | | | |
| 3 | A Zverev | 3 | 4 | | | | | | | | | | | | B Shelton | 6$^2$ | 7$^7$ | 6 |
| 8 | F Auger-Aliassime | 7$^7$ | 6$^2$ | 6 | | | | | | | | | | Q | M Giron | 7$^7$ | 6$^5$ | 4 |
| | A Vukic | 6$^3$ | 7$^7$ | 2 | 8 | F Auger-Aliassime | 6 | 6 | | | | | | | | | | |
| | S Ofner | 6$^2$ | 7$^7$ | 7 | | S Ofner | 4 | 1 | | | | | | | | | | |
| | C O'Connell | 7$^7$ | 6$^5$ | 5 | | | | | | 8 | F Auger-Aliassime | 1 | 4 | | | | | |
| | Y Nishioka | 6$^{14}$ | 6 | 1 | | | | | | Q | M Giron | 6 | 6 | | | | | |
| Q | M Giron | 7$^{16}$ | 4 | 6 | Q | M Giron | 6 | 6 | | | | | | | | | | |
| WC | Y Watanuki | 6$^6$ | 3 | | 2 | C Ruud | 3 | 4 | | | | | | | | | | |
| 2 | C Ruud | 7$^8$ | 6 | | | | | | | | | | | | | | | |

## Qualifying
### Seeds

* Rinky Hijikata (qualifying competition)
* Marcos Giron (qualified)
* Jack Draper (qualified)
* Taro Daniel (qualified)
* Cristian Garín (qualified)
* Jurij Rodionov (qualifying competition)
* Brandon Nakashima (first round)
* Wu Tung-lin (first round)

### Qualifiers

* Cristian Garín
* Marcos Giron
* Jack Draper
* Taro Daniel

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Rinky Hijikata | 6 | 7 | | | | | |
| WC | Naoki Nakagawa | 4 | 5 | | | | | |
| WC | Naoki Nakagawa | 4 | 5 | 1 | Rinky Hijikata | 7 | 3 | 2 |
| | | | | 5 | Cristian Garín | 5 | 6 | 6 |
| | Philip Sekulic | 6$^3$ | 3 | 5 | Cristian Garín | 5 | 6 | 6 |
| 5 | Cristian Garín | 7$^7$ | 6 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Marcos Giron | 6 | 6 | | | | | |
| WC | Kaichi Uchida | 4 | 3 | | | | | |
| WC | Kaichi Uchida | 4 | 3 | | 2 | Marcos Giron | 6 | 6 |
| | | | | | | Yasutaka Uchiyama | 3 | 2 |
| | Yasutaka Uchiyama | 7$^8$ | 4 | 6 | | Yasutaka Uchiyama | 3 | 2 |
| 7 | Brandon Nakashima | 6$^6$ | 6 | 3 | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Jack Draper | 6 | 6 | | | | | |
| | Yuta Shimizu | 4 | 4 | | | | | |
| | Yuta Shimizu | 4 | 4 | | 3 | Jack Draper | 6 | 6 |
| | | | | | 6 | Jurij Rodionov | 1 | 0 |
| WC | Hiroki Moriya | 4 | 7 | 3 | 6 | Jurij Rodionov | 1 | 0 |
| 6 | Jurij Rodionov | 6 | 5 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Taro Daniel | 6$^1$ | 6 | 6 | | | | |
| | Jason Jung | 7$^7$ | 3 | 3 | | | | |
| | Jason Jung | 7$^7$ | 3 | 3 | 4 | Taro Daniel | 7 | 6 |
| | | | | | | Rio Noguchi | 5 | 4 |
| | Rio Noguchi | 5 | 6 | 6 | | Rio Noguchi | 5 | 4 |
| 8 | Wu Tung-lin | 7 | 0 | 3 | | | | |