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)

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