World reacts to brutal Kamaru Usman-Colby Covington battle at UFC 245

Kamaru Usman, right, stopped Colby Covington in the fifth round to retain his UFC welterweight title on Saturday night. Brett Carlsen for ESPN

Kamaru Usman and Colby Covington traded blistering shot after blistering shot throughout their welterweight title fight at UFC 245 on Saturday night, and neither did much blinking. It was anyone's fight, really, entering Round 5 in Las Vegas.

But that's where Usman, the defending champion, delivered. He sent Covington to the deck for the first knockdown of the fight, then put him down again and finished him with ground and pound. It was a spectacular ending to a surefire fight of the year candidate, one that Covington said he was fighting with a broken jaw after Round 3.

Not surprisingly, many in the MMA and sports and entertainment world took to social media to give their thoughts on the fight. While some took pleasure in the demise of Covington, MMA's resident "heel," many lauded both competitors.