Watch The Weigh-Ins & Hydration Tests For ONE Fight Night 41: Sinsamut Vs. Jarvis

Before the fireworks ignite at Lumpinee Stadium, every athlete competing at ONE Fight Night 41: Sinsamut vs. Jarvis on Prime Video must first take care of business on the scale.

The U.S. primetime event goes down live this Friday, March 13, in Bangkok, Thailand. But before anyone attempts a takedown or even throws a single strike, every fighter must successfully weigh in and pass their hydration tests to earn the right to compete.

Fans can watch the official ONE Fight Night 41 Weigh-Ins & Hydration Tests by clicking the video below beginning at 6 a.m. ET/5 p.m. ICT on Thursday, March 12.

In the main event, former ONE Lightweight Muay Thai World Title challengers Sinsamut "Aquaman" Klinmee and George "G-Unit" Jarvis collide in a high-stakes showdown, and a victory could put the winner on the road back to a crack at Regian "The Immortal" Eersel's coveted belt.

Sinsamut returns after taking a year away from competition to grow his social media brand and welcome his second child. The 30-year-old Thai veteran is refreshed, refocused, and ready to remind the division why he remains one of its most dangerous threats.

The Thai's laundry list of big-name knockout victories - including former Glory Kickboxing World Champion Nieky Holzken, WBC Muay Thai World Champion Liam Nolan, and ISKA European Champion Nauzet Trujillo - tells the story of a fighter who performs when the lights are the brightest.

Standing across the ring from him is Jarvis, a 25-year-old British hard-hitter who has never backed down from a challenge in his professional career. After suffering a tough loss to Eersel at ONE Fight Night 34 last August, "G-Unit" spent months in Thailand preparing for this moment. A win over a legitimate contender like Sinsamut would instantly reignite his World Title campaign and prove that last August was nothing more than a temporary setback.

In the co-main event, ONE Welterweight Submission Grappling World Champion Tye Ruotolo puts his gold on the line against Polish phenom Pawel Jaworski in a battle of elite BJJ black belts.

Ruotolo has been unstoppable since joining ONE Championship in 2022, claiming the inaugural welterweight belt, defending it twice, and then submitting two undefeated MMA rising stars to go a perfect 10-0 on the global stage. Now, he returns to his grappling roots, but Jaworski is no ordinary challenger.

The Polish sensation captured the 2025 IBJJF No-Gi World Championship and claimed double gold at the IBJJF No-Gi Europeans, and his devastating leg-lock game makes him a genuine threat to end Ruotolo's unbeaten run inside ONE Championship.

Take a look at the full card below, and don't miss the ONE Fight Night 41 Weigh-Ins & Hydration Tests.

Full Card For ONE Fight Night 41

Sinsamut Klinmee vs. George Jarvis (Muay Thai - lightweight)
Tye Ruotolo vs. Pawel Jaworski (ONE Welterweight Submission Grappling World Title)
John Lineker vs. Ben Woolliss (kickboxing - featherweight)
Lee Seung Cheol vs. Fabio Henrique (MMA - strawweight)
Hyu Iwata vs. Suablack Tor Pran49 (kickboxing - flyweight)
Victoria Souza vs. Anastasia Nikolakakos (MMA - women's atomweight)
Marcos Aurelio vs. Mauro Mastromarini (MMA - bantamweight)
Anna "Supergirl" Jaroonsak vs. Yu Yau Pui (Muay Thai - women's atomweight)
Jeremy Miado vs. Willie van Rooyen (MMA - flyweight)

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