Undefeated unified junior featherweight world champion Guillermo “El Chacal” Rigondeaux (14-0, 9 KOs) scores a first round KO over two-time world title challenger Sod Looknongyantoy (63-3-1, 27 KOs) on Saturday night at the Venetian Macao’s Cotai Arena.

Looknongyantoy was rocked by an accidental headbutt and went down. When action resumed, they touched gloves, then Rigondeaux pounced and immediately landed a combination that dropped him. The bout was waved off by referee Mark Nelson after just 1:44.

Rigondeaux and Top Rank will now go their separate ways.

Chris Robinson can be reached at CRobinson@hustleboss.com