UFC welterweight champion Kamaru Usman knocked out Jorge Masvidal in Florida Staruday to prove once again he's the best in his class.

Last summer, the Nigerian ground out a one-sided decision over Masvidal. But after Masvidal (35-15) spent the next several months chirping it was a fluke, Usman (19-1) granted him a rematch, wanting to put a stamp on things this time.

Nigerian Usman knocked out Masvidal with an absolutely hellacious right hand, leaving no doubt he's the best in his class. The time of the stoppage at VyStar Veterans Memorial Arena in Jacksonville, Florida, was 1 minute 2 seconds of the second round.

"I told everyone, I'm still getting better, I'm still getting better," Usman said. "The sky is the limit for me."

Usman outwrestled Masvidal in the first round, landed crisp jabs, and previewed what was to come by loading up on a couple of big bombs that just missed. In the second, he didn't miss, as he won his 18th straight bout and had his fourth successful title defense.

The evening's co-feature bout was fast and electrifying, as Colorado's Rose Namajunas became a two-time strawweight champion with a first-round finish of China's Zhang Weili.

Namajunas (11-4) hit a picture-perfect head kick which floored Weili, then followed up with punches until the referee waved it off at the 1:18 mark. Weili (21-2), who had a 21-fight win streak snapped, protested the stoppage, but she was plainly out of sorts and on wobbly legs when she got back to her feet.

"I did it again," said Namajunas. "I'm the best."

In the evening's third title fight, flyweight titleholder Valentina Shevchenko had one of the most dominant performances in a career full of them as she successfully defended her title against former strawweight champ Jessica Andrade.

Shevchenko (21-3) seemed to make a point of thoroughly outgrappling Andrade (21-9), who is known for her groundwork, before finishing her via TKO at the 3:19 mark of the second round. It was the seventh straight win for Shevchenko and her 14th career finish.