Brendan Allen submits Christian Leroy Duncan in the fifth round, turning UFC Vegas 122 into a statement fight

Brendan Allen’s night at UFC Vegas 122 ended the way contenders like to, with control and a finish that arrived when opponents start making desperate choices. In the middleweight main event Saturday, October 10, at Meta Apex in Las Vegas, Allen secured a rear-naked choke to submit Christian Leroy Duncan in the fifth round.

The outcome mattered for Allen’s position in the middleweight picture because the fight itself was framed as a response to a trend: Allen has reportedly been “fighting down the rankings lately,” a theme highlighted in the coverage ahead of the event. Against Duncan, Allen delivered an impressive win that supporters can point to as evidence he is ready for opponents closer to the division’s top tier.

Allen’s path to the late choke, as described in the reporting, emphasized staying in the fight long enough to let openings appear. The rear-naked choke is often a product of sustained grappling pressure, and the timing here, coming in round five, suggests the end came after Allen had repeatedly positioned himself for dominant control and then converted it when Duncan’s options ran thin.

For Duncan, the loss is a reminder of how quickly a middleweight contest can flip when one fighter commits to a closing path to the back. Rear-naked chokes punish both posture and balance, and by the fifth round the fight had reached the kind of uncomfortable stretch where a small mistake can become the difference between survival and stoppage.

Allen’s performance also reshaped how the narrative around his next steps will likely be discussed. The post-fight question becomes not just whether he can beat a quality opponent, but whether his style and fight management translate when the opponent brings the kind of power and defensive wrestling that usually comes with being higher in the rankings.

What to watch next is how UFC matches Allen after a win that the reporting casts as one of his strongest to date. If the organization rewards the finish with a more consistently elite opponent level, Allen’s ability to make good fights out of longer, riskier rounds will be tested again quickly.

From a broader UFC-events standpoint, UFC Vegas 122’s main event finish also reinforced the modern middleweight trend: even when striking exchanges are competitive, late-round grappling can decide the bout, particularly when fighters are willing to stay committed long after the pace begins to tax their reserves.