Arman Tsarukyan was not always scheduled to fight Mauricio Ruffy at UFC 331. His original opponent was Charles Oliveira, in a rematch of their close UFC 300 decision. That fight fell apart on August 4, one day before the UFC announced the full card. Dana White has since confirmed the switch himself.
Why the Oliveira Rematch Fell Apart
Oliveira 37-11-0 withdrew after his longtime teammate, UFC flyweight Allan Nascimento, died suddenly on August 3. Nascimento suffered a heart attack in his sleep at age 34. Oliveira needed time to grieve, not prepare for a five-round fight. That is a real, human reason, not a scheduling dispute or an injury excuse.
Brazilian reporter Leo Guimaraes confirmed the timeline directly. Oliveira was booked, then pulled out the very next day, forcing the UFC to move fast. Ruffy had already shown he could jump in on short notice, having been ready to step in at UFC 329 last month. That readiness made him the obvious replacement.
What Most Coverage Gets Wrong About This Change
Dana White confirmed the opponent switch himself, but stayed vague about the details. He told reporters in Dublin that Tsarukyan’s original opponent simply “fell out,” without naming Oliveira or explaining the reason. That silence let speculation fill the gap for several days before the real story came out.
Most articles frame this purely as bad luck for Tsarukyan, losing a marquee rematch for a lower-profile fight. That framing misses the actual incentive at play. Tsarukyan has reportedly been guaranteed a title shot if he beats Ruffy, a reward for accepting a tougher, lower-reward fight without complaint.
That detail changes the entire story. Beating Ruffy alone would not normally justify a title shot over other contenders. But Tsarukyan agreeing to a dangerous opponent on short notice, after already sitting out over a year, gives the UFC a clean reason to reward him regardless of how flashy the resume looks after the fight.
Why This Matters for Tsarukyan’s Title Case
Tsarukyan has a complicated history with UFC matchmakers. He pulled out of a UFC 311 title fight against Islam Makhachev one day before weigh-ins, citing a back injury. That decision reportedly damaged trust with UFC leadership for months afterward, even as he kept winning fights.
Daniel Cormier said this opponent change actually strengthens Tsarukyan’s case, not weakens it. Ruffy carries real danger and less name value than Oliveira, meaning Tsarukyan gets less credit for a win but more credibility for accepting the fight anyway. Cormier called this willingness to “say yes to everybody” the clearest signal yet that Tsarukyan is serious about earning trust back.
Ruffy enters on a two-fight win streak, including a first-round TKO of Michael Chandler in June. He is ranked No. 10 at lightweight, a legitimate step down from Oliveira on paper. But Ruffy’s finishing rate and recent form make this a live threat, not a tune-up fight disguised as a title eliminator.
Conclusion
Arman Tsarukyan’s original opponent at UFC 331 was Charles Oliveira, and that fight collapsed for a tragic, human reason, not a business decision. The switch to Mauricio Ruffy looked like a step down in profile, but it may end up being the smarter move for Tsarukyan’s title hopes.
Accepting a dangerous, lower-reward fight without pushback is exactly the kind of move UFC brass tends to remember. If Tsarukyan beats Ruffy in September, expect a title shot conversation to start immediately, built on trust as much as the win itself.
