FAIRFAX, Va. - Both Mike Guymon and Rory MacDonald made their UFC debuts on the undercard at UFC Fight Night 20 here at the Patriot Center on the campus of George Mason University.

Let's get to know these fellas before we tell you about their welterweight bout:

MacDonald is a 20-year-old Canadian who has finished all nine of his previous pro fights. Impressive.

Guymon (12-2-1) rocks a Chuck Liddell-esque Mohawk and has finished his last five fights.

And one of them just finished the fight.

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The fight went to the ground late in the first round, when MacDonald got control of Guymon and locked in an armbar for the submission with 33 seconds left. An impressive start to his UFC career.

"I didn't think I was going to get that armbar that easily," MacDonald said. "But it's a fight, things happen and you make mistakes. I went for the Americana (kimura), then I changed my grip to the nearside arm, and I knew I had it."

Oh yeah, by the way, did we mention that he's 20 years old?