Yeah, KSI never stood a chance.
The popular streamer hit the mat with former UFC flyweight champion Demetrius Johnson, challenging him to submit him in less than one minute. KSI got to choose the position in which they would start, and went with full mount – one of the most dominant positions in jiu-jitsu. Yet, despite the positional and weight advantage, KSI only lasted 17 seconds against the flyweight GOAT.
You can watch the video of their quick grappling match in the video below:
KSI tried grappling with Demetrious Johnson and surviving for a minute, and only lasted 17 seconds 😭
🎥 @MightyMousepic.twitter.com/GGtSUgIncy
— Championship Rounds (@ChampRDS) June 16, 2025
Johnson, 38, is regarded as the greatest flyweight of all time. He defended the 125-pound title 11 consecutive times, setting and maintaining the record for the most consecutive title defenses in UFC history. “Mighty Mouse” announced his retirement from MMA last September, putting an end to a legendary 15-year-career in MMA.
KSI, one of the word’s most popular streamers, turned to the combat sports world in recent years. He’s specifically been fighting professionally in boxing, and owns his own promotion – Misfits Boxing, which streams on DAZN.
This article originally appeared on MMA Junkie: Video: UFC legend Demetrious Johnson submits KSI in 17 seconds