5th World Open Championship in Kyokushin karate (Rengokai). Yokohama, Japan, 8–9 April 2023.

Winners

  1. Yuhei Ashitaka — Japan
  2. Sho Shigematsu — Japan
  3. Rai Hayakawa — Japan
  4. Yudai Ishimine — Japan
  5. Takadera Kaito — Japan
  6. Katagiri Daiya — Japan
  7. Michael Cordeiro — Canada
  8. Timur Raiymbekov — Kazakhstan