Alex Pereira retains title via headbutt knockout against Jiri Prochazka

Alex Pereira is back in the Octagon on October 5th when he takes on Khalil Rountree Jr. in the main event of UFC 307. Brazil's two-division champions and the LA contender face off live on pay-per-view from the Delta Center in Salt Lake City, Utah.

Pereira (11-2) is fighting for the third time this year and defending his light heavyweight title for the third time. The 37-year-old was in action in Las Vegas in June, where he faced old rival Jiri Prochazka in a rematch headlining UFC 303.

In addition to their first fight for the vacant 205-pound belt last November in New York, the championship rematch scheduled for five rounds also ended before the final horn. Pereira KO'd Prochazka with a switch left kick to the head in the second round, making the second successful defense of his strap.

In his next fight at UFC 307 in SLC on Saturday, Alex Pereira defends his title against No. 8 contender Khalil Rountree Jr. The 34-year-old is coming off five straight wins and making his first attempt at the top of the division.