StubHub Center, Carson, California - Viktor Postol (28-0, 12KOs) had a huge coming out party with a big upset victory - scoring a tenth round knockout of the hard-chinned Lucas Matthysse (37-4, 34KOs) to capture the vacant WBC junior welterweight world title.

The championship became vacant after Danny Garcia moved up to the welterweight division a few months ago.

In the eight, Postol started working over Matthysse with the jab and big right hands. One of those punches actually staggered Matthysse to the ropes. The hard puncher reovered quickly. Postol continued to come on strong in the ninth, outworking and outjabbing the hard puncher. Postol was moving, landing well and putting his punches together with combinations.

In the tenth, Postol was moving very well, stopping to land short punches and blocking most of Matthysse's return fire. During the tenth, a big right hand sent Matthysse down for the full count.

"I felt a pop in my eye," Matthysse said. "I preferred to take care of my eye. I could have gotten up but I preferred to stay down to protect my eye. Nothing happened for me tonight."