Watch Vitor Belfort's knockout of Luke Rockhold at UFC on FX 8

Vitor Belfort, from Brazil, celebrates after defeating Michael Vitor Belfort, from Brazil, celebrates after defeating Michael Bisping, from Britain during their middleweight mixed martial arts bout at the Ultimate Fighting Championship (UFC) in Sao Paulo, Brazil, Sunday, Jan. 20, 2013. (AP Photo/Andre Penner) Photo Credit: AP Photo Andre Penner

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It was a spinning back heel kick from Vitor Belfort delivered to the side of the head belonging to Luke Rockhold.

It was rather impressive.

And it was yet another first-round knockout for Belfort, who won in his native Brazil on Saturday night at UFC on FX 8.

Watch the knockout below. (Scroll to around the three-minute mark if you're not into the recap of the previous bouts on the main card, include Jacare Souza's first-round stoppage over Chris Camozzi.

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