At the MGM Grand "Bubble" - "Cassius" Clay Collard train rolled through Las Vegas once again, as Collard knocked out Lorawnt-T Nelson in the second round of a scheduled six-round middleweight contest. (photos by Mikey Williams)

Collard (8-2-3, 3 KOs) improved to 4-0 on the year, including three victories over previously undefeated fighters. He knocked down Nelson (5-4, 4 KOs) in the opening round and twice more in the second before referee Celestino Ruiz stopped the fight.

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Ruben Cervera (12-2, 10 KOs) picked up his second straight win, topping Clay "3rd Degree" Burns (9-9-2, 4 KOs) by six-round unanimous decision in a lightweight bout. Cervera knocked down Burns with a left hook in the opening round and prevailed by scores of 59-54 2x and 58-56.

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Middleweight Javier Martinez had a successful professional debut, shutting out Ryan "The Lion" Burrs (2-2) over four rounds by identical 40-36 scores. Martinez, from Milwaukee, inked a multi-year professional contract with Top Rank following a storied amateur career with USA Boxing.

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