Quincey Williams stopped Jose Perdomo in the fourth and final round of their junior middleweight bout.
In round four, Williams staggered Perdomo with a straight right to the head. He followed that up with another crushing right that sent Perdomo down for the 10-count at 2:11.
Williams, 150 lbs of Washington, DC is 5-0 with five knockouts. Perdomo, 151.2 lbs of Montevudeo, URU is 6-7.