The reigning UFC bantamweight champion secured his first-ever UFC submission on Saturday, tapping out Sean O'Malley with a nasty choke to defend his title at UFC 316.

A pair of title bouts will top the marquee as bantamweight champion Merab Dvalishvili defends his title in the main event in a rematch against former champion Sean O'Malley. In the co-feature, women's bantamweight titleholder Julianna Pena welcomes her highly favored challenger Kayla Harrison.

UFC 316 is a must-watch event with a rematch between Merab Dvalishvili and Sean O'Malley. Here are the live updates, results and highlights.

Kayla Harrison (19-1 MMA, 3-0 UFC) was the most heavily favored title challenger in UFC history at nearly 8-1, and she showed why when she took apart women’s bantamweight champion Julianna Peña (13-6 MMA, 8-4 UFC) with ease for a second-round submission. The two-time Olympic champion brought Amanda Nunes out of retirement for a superfight.

Check out the top social media reactions to Kayla Harrison's title victory over Julianna Peña in the UFC 316 co-main event.

Kayla Harrison and Merab Dvalishvili put on a pair of standout performances to win their championship bouts Saturday at UFC 316. In the main event of the evening, men’s bantamweight champion Merab Dvalishvili submitted Sean O’Malley to score a second victory over his rival,