Mauricio Ruffy reveals costly mistake before Arman Tsarukyan KO

Brazilian UFC lightweight Mauricio Ruffy has reflected on his stunning first-round knockout loss to Arman Tsarukyan at UFC 331, pinpointing a critical lapse in defense during the final seconds as the decisive factor. Ruffy rocked Tsarukyan early in the bout, visibly damaging the challenger with strikes and leaving him with a badly swollen eye, suggesting momentum was in Ruffy's favor heading into the second round.

Ruffy defended every takedown attempt from Tsarukyan and felt the wrestling threat diminishing as the round progressed. Confident he would finish a hurt opponent in round two, Ruffy made a calculated—but ultimately costly—decision when hearing the 10-second warning. Rather than escape the clinch and preserve his position, he chose to let Tsarukyan exhaust himself, expecting the round to end cleanly. In those final moments, Tsarukyan landed a decisive elbow from the clinch that dropped Ruffy.

In a detailed Instagram post, Ruffy accepted full responsibility for the loss, describing it as "my carelessness" and crediting Tsarukyan's excellent timing and fighting instincts. The 14-3 fighter acknowledged that relaxing his defensive focus—unusual for him—proved fatal. Despite the setback, Ruffy expressed gratitude for the learning opportunity and vowed to grow from the experience. He apologized to fans while noting that he had shown steady improvement across his UFC run and remains committed to his development as a fighter. Tsarukyan improved to 24-3 and continues pursuing the lightweight title shot he believes the UFC has promised him.