Reinier de Ridder faces Brendan Allen in a pivotal middleweight main event tonight. The entire fight card is filled with 13 competitive, high-action matchups. Main card and preliminary card available for streaming for ESPN+ subscribers with no extra charge.

UFC 321 is in the books. The eleventh pay-per-view event of the world's leading MMA promotion took place on Oct. 25 at the Etihad Arena in Abu Dhabi, United Arab Emirates.

The UFC returns to Abu Dhabi for its annual October pay-per-view extravaganza, and this year's card is no exception.