Ryusei Kumagai

KNOCK OUT 63 Spring Fes in Okinawa was a kickboxing event held by KNOCK OUT on Saturday, April 18, 2026, at the Okinawa Convention Center in Ginowan, Okinawa, Japan. In the main event, Ryoki faced Sitthichai Sitsongpeenong.

KNOCK OUT 68 KNOCKIN' ON THE WORLD was a kickboxing event held by KNOCK OUT on Saturday, September 5, 2026, at Yokohama Budokan in Yokohama, Japan. In the main event, Ryusei faced Kaewganwan Sor.Amnuwaides.

KNOCK OUT.60: K.O CLIMAX 2025

KNOCK OUT 65 THE KNOCK OUT 2026 was a kickboxing event held by KNOCK OUT on Sunday, June 21, 2026, at the Yoyogi National Gymnasium 2nd Gymnasium in Tokyo, Japan. In the main event, Ryusei faced Reiya Komori.

ONE 172: Takeru vs. Rodtang was a combat sports event produced by ONE Championship that took place on March 23, 2025, at the Saitama Super Arena in Saitama, Japan. A five-round flyweight kickboxing superfight between former ONE Flyweight Muay Thai World Champion Rodtang Jitmuangnon and former three-divisions K-1 World Champion Takeru Segawa headlined the event.

THE KNOCK OUT takes place on June 22, 2025, at the Yoyogi National Gymnasium Second Gymnasium in Tokyo, Japan. Key fights include the main event title rematch between Taimu Hisai and Ryusei, plus title bouts like Shogo Kuriaki vs. Kazuma Kuramoto, Isshi vs. Yuki Morioka, and Yota Shigemori vs. Kongnapa Weerasakreck.