MarQuel Mederos just kicked the door off the hinges at UFC Sacramento, stopping Mason Jones in the second round and giving the Welsh lightweight the first finish loss of his MMA career. After a night already stacked with chaos, from Chris Padilla choking Nasrat Haqparast at the horn to Stan Dorsainvil surviving a firefight, Mederos made sure his own highlight did not get buried.
The lightweight bout ended at 2:07 of Round 2 at Golden 1 Center in Sacramento, California. Mederos hurt Jones in close, kept throwing while Jones tried to stay upright, and forced the standing TKO before this thing could turn into another judges’ scorecard headache. It was mean, clean, and exactly the sort of upset clip that makes the prelims worth watching.
The official UFC on Paramount+ clip is below.
BUILT FOR THIS 😤
Marquel Mederos with a huge upset tonight for the biggest win of his life!
[ #UFCSacramento | LIVE on @ParamountPlus ] pic.twitter.com/DneWbccQFB
— UFC on Paramount+ (@UFConParamount) August 23, 2026
Mederos Turns A Scramble Into A Statement
Jones came in with the kind of gritty reputation that usually makes opponents pay rent for every inch. He had been stopped before in neither MMA nor the UFC, which made this result hit harder than a normal early-card finish. Mederos did not just win a fun fight. He cracked a durable lightweight who had built his whole run around pressure, volume, and being a pain to shake off.
The fight was not some one-shot robbery either. Mederos had to deal with Jones making it ugly, pushing exchanges, and trying to drag him into the kind of grind where momentum can flip fast. Once Mederos found the damaging shots, though, Jones’ defense started leaking. The finishing sequence was all urgency, with Mederos unloading while the referee watched Jones absorb too much clean work without firing back enough to stay in it.
That moves Mederos to 12-1-1 overall and 4-0-1 in the UFC, a sneaky strong start for a lightweight still fighting for wider recognition. Lightweight is a shark tank on a good day and a parking-lot brawl on a bad one, but stopping Jones is the kind of result that should get matchmakers to stop treating Mederos like a quiet name on the bout sheet.
Jones falls to 18-3 overall and 4-3 in the UFC, and the loss stings because it came in the exact area where he is usually trusted to survive. He has the cardio and toughness to make fights miserable, yet Mederos beat him to the violent answer before Jones could settle into his rhythm.
For a UFC Sacramento card already producing highlight chaos, this one fits right next to Jackson McVey’s nasty knee TKO as another reminder that the regional-flavored cards can still deliver real damage. Mederos wanted a statement, and handing Mason Jones his first MMA stoppage loss is a pretty loud way to ask for a bigger name.
