Arman Tsarukyan vs. Mauricio Ruffy Set for UFC 331 Co-Main Event

A lightweight collision between two of the division's most dangerous contenders is now official. Arman Tsarukyan will meet Mauricio Ruffy in a five-round co-main event at UFC 331 on September 19, after Charles Oliveira withdrew from his previously scheduled bout with Tsarukyan for personal reasons.

Tsarukyan, 29, enters the matchup ranked second in the lightweight division with a 23-3-0 record. The Russian product of American Top Team is one of the more well-rounded threats in the 155-pound weight class, averaging 3.85 significant strikes per minute at 50 percent accuracy while also threatening with a career-high 3.26 takedown attempts per 15 minutes. Standing five-foot-seven with a 72-inch reach, he has long been positioned as a title contender and will look to reassert himself in a five-round format.

Ruffy, the seventh-ranked lightweight out of Brazil's The Fighting Nerds, steps in as the replacement on the strength of an impressive 14-2-0 record. The 30-year-old stands five-foot-eleven with a 75-inch reach and has built his reputation as a sharp, high-volume striker — averaging 4.19 significant strikes per minute at a 58 percent accuracy rate, numbers that rank among the best in the division. His game is firmly based on the feet, with no recorded takedowns or submission attempts in his UFC career.

Why it matters

• Tsarukyan's ranking and five-round scheduling suggest the lightweight title picture remains directly in play for the winner.
• Ruffy's elite striking accuracy and output will be tested against a wrestler-striker with significant grappling volume.
• A Ruffy victory would propel him from seventh into legitimate title contention; a Tsarukyan win keeps him on course for a championship shot.
• Oliveira's withdrawal reshuffles the top of the lightweight division heading into the fall.