Mederos becomes first fighter to finish Jones with second-round knockout at UFC Sacramento

MarQuel Mederos made history at UFC Sacramento on Saturday, becoming the first fighter to finish Mason Jones with a second-round standing knockout that ended at 2:07 of round two.

The lightweight matchup delivered exactly the firefight it promised. Both men traded hard strikes and combinations for the better part of one and a half rounds, with Jones refusing to wilt even as Mederos pressed him to the fence in the second. Jones attempted to answer back until the very end — he never hit the canvas — but referee Jason Herzog stepped in to wave it off as Mederos unleashed a furious closing flurry.

Mederos (12-1-1) had been ahead on the scorecards heading into round two and did not relent. The win preserves his perfect record inside the octagon, where he is now 4-0-1 across all UFC appearances.

For Jones (18-3, 1 NC), it is a first defeat in his second stint with the promotion. The Welsh lightweight had won three consecutive fights after re-signing with the UFC in 2025, making the finish all the more notable — no opponent had ever stopped him across a professional career stretching back more than two decades of bouts.