SUPER RIZIN.4 takes place on July 27, 2025, at Saitama Super Arena (Stadium Version) in Saitama, Japan. The main event features Mikuru Asakura taking on Kleber Koike. The card also includes Naoki Inoue facing Ryuya Fukuda for the RIZIN Bantamweight title. Inoue, a 28-year-old submission expert, clashes with 31-year-old DEEP two-division champion Fukuda.

Witness the Fight Card of the Decade! Celebrate 10 years of Japan's RIZIN Fighting Federation's spectacular martial arts legacy with the ultimate year-end event! This is more than a fight card—it’s a night of champions, legends, and rising stars.

RIZIN 50 is RIZIN's first Shikoku tournament as a part of the opening commemoration event of Anabuki Arena. The main event is a bantamweight title match between Naoki Inoue and Yuki Motoya!

The card will be headlined by a rematch between Yuki Egawa and Tatsuya Tsubakihara for the K-1 Featherweight title. The two previously fought at the K-1 World GP 2020 in Osaka, with Tsubakihara winning a majority decision. In the co-main event, the K-1 Super Lightweight champion Hideaki Yamazaki is scheduled to fight Fukashi Mizutani in a non-title bout. Former two-time Krush Welterweight title challenger Kaisei Kondo will face Maki Dwansonpong. K-1 and Krush Cruiserweight title challenger Hisaki Kato is scheduled to fight Mahmoud Sattari.