Heavyweight Dominic Breazeale, a 2012 U.S. Olympian from Alhambra, is now 6-0 with six knockouts after knocking out Lenroy Thomas of Jamaica at 2:29 of the fourth round Saturday. The two tangled on the undercard of the Abner Mares-Jhonny Gonzalez featherweight title fight at StubHub Center.

Breazeale, 27, landed a right uppercut that put Thomas down on the canvas. He stayed there on one knee, never really trying to get to his feet. Thomas (16-3) had won 16 of his past 17 bouts.