In the pay-per-view opener, Sharmba Mitchell (56-4) won a five-round technical decision over Chris Smith (19-2-1) in his welterweight debut.

Mitchell was leading on the scorecards when he and Smith cracked heads accidentally early in the fifth round. Mitchell emerged from the hard clash with a cut under his left eye and appeared in significant pain. He was given time to recover but he didn't and referee Kenny Chevalier stopped the fight on advice of the ringside doctor.

Mitchell was leading on all three scorecards, 50-45, 48-47 and 48-47. He was fighting at 147 pounds for the first time after deciding to move up following last November's third-round knockout loss to then-junior welterweight champion Kostya Tszyu.

"I got caught with a head butt. End of story," said Mitchell of nearby Tacoma Park, Md., "when we came together our heads clashed and it felt like my eye exploded. I started out well. I was landing my combinations and then we clashed heads."

Smith lost his second fight in a row but looked better against Mitchell than he did in January when he suffered his first defeat, an 11th-round TKO against David Estrada.

The Smith camp was disgusted with the decision to end the bout.

"Sharmba quit, he just quit, that's what he did," said Johnny Bos, Smith's agent. "He didn't want to fight no more. Chris was starting to get to him and when he got a little cut under his eye he checked out."