Tokyo 2020 medal prospect Daiya Seto returned to competition Thursday at the Japan Open event for the first time since his disciplinary confinement was lifted at the end of last year.

Hitting the water at the brand-new Tokyo Aquatics Center, Seto made his comeback in a victorious fashion, finishing with a time of 4 minutes and 12.57 seconds in the men’s 400-meter individual medley final.

“I disappointed so many people associated with me because of my thoughtless actions last year,” Seto said after the race, referring to an extramarital affair that went public after being revealed by a tabloid report. “I deeply regret that.”