Light heavyweight champion Alex Pereira will face surging challenger Khalil Rountree Jr. in the main event of UFC 307 in Salt Lake City on Sunday. Pereira has successfully defended his title twice, while Rountree Jr. enters the fight on a five-fight winning streak. The event also features several other exciting matchups, including Raquel Pennington vs. Julianna Pena and Jose Aldo vs. Mario Bautista.