Seika Izawa Remains Unbeaten After First-Round Submission
Seika Izawa submitted Shin Yu-jin by arm-triangle choke at 2:24 of Round 1 at Super RIZIN.4 on July 27, 2025. The win was officially recorded for Izawa, but the bout was held as a non-title catchweight contest after Shin missed weight.
Official Result
Seika Izawa def. Shin Yu-jin by submission (arm-triangle choke), Round 1, 2:24. The official RIZIN report lists the finish as a tap-out. Izawa was the reigning women’s Super Atomweight champion entering the contest.
Why the Bout Was Not for the Title
The matchup was originally scheduled as a Super Atomweight title fight at 49 kilograms. On July 25, RIZIN announced that the bout would instead take place at a 52-kilogram catchweight after Shin’s team said she could not make the contracted 49-kilogram limit. Both sides agreed to the change, so the championship was not at stake.
At the official weigh-in, Shin came in 0.85 kilograms over the 52-kilogram limit. RIZIN’s event rules set conditional terms: Izawa’s win would count, while a loss or draw for her would be recorded as a no contest. Shin also received a red-card penalty. Izawa secured the submission and earned an official victory.
Super RIZIN.4 Context
The bout took place at Saitama Super Arena in Saitama, Japan, on a card that also featured Tatsuya Ando’s second-round submission of Yang Ji-yong. Read our full Super RIZIN.4 results and recap and our Ando–Yang fight report for more coverage.
Context and Significance
The catchweight detail is important to the result because Shin missed weight and the bout proceeded as a non-title contest. Izawa still recorded a first-round arm-triangle submission at 2:24, but the victory did not function as a championship defense. The official event record captures both points: the method and time, and the altered status of the bout.
