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‘Careless’ Mauricio Ruffy reacts to UFC 331 knockout loss, claims he would’ve stopped Arman in Round 2 – ‘I was certain’

It was a mistake. Ultimate Fighting Championship (UFC) Lightweight knockout artist Mauricio Ruffy suffered a first-round stoppage loss to No. 1 title contender Arman Tsarukyan in UFC 331’s co-main event this past weekend (Sat., Sept. 19, 2026) inside Crypto.com Arena…

By Alexander Behunin · MMA Mania

Published: Wednesday, 23 September 2026 at 11:43 PM

Key Things to Know

Arman Tsarukyan defeated Mauricio Ruffy via first-round knockout at UFC 331 in Los Angeles.
The lightweight co-main event took place at Crypto.com Arena on September 19, 2026.
Ruffy accepted the fight on roughly six weeks and four days of notice.

The Story in 60 Seconds

Mauricio Ruffy responded on social media following his first-round knockout loss to Arman Tsarukyan at UFC 331. The lightweight co-main event bout took place on September 19, 2026, at Crypto.com Arena in Los Angeles, California. Tsarukyan stopped Ruffy with an elbow in the closing seconds of the opening round.

Ruffy stated that he accepted the bout on just over six weeks' notice and felt prepared during his training camp. Despite suffering the stoppage defeat, Ruffy claimed he had Tsarukyan hurt during the fight and expressed certainty that he would have finished the matchup in the second round.

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