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.

B oth the UFC men's and women's bantamweight belts will be on the line at UFC 316 from Newark, New Jersey, on Saturday (10 p.m. ET on ESPN PPV, with prelims at 8 p.m. on ESPN/ESPN

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,