Badou Jack KO4 Derwin Colina... In the co-feature prior to the Mayweather-Paul exhibition, Derwin Colina tried his best but the late replacement was no match for former WBC super middleweight champion Badou Jack. Colina (15-1) came in undefeated, unknown and untested. About a week ago, Colina stepped in for Jack's planed opponent, Jean Pascal after Pascal failed a pre-fight drug test. Colina quickly proved to be a crude pug. Colina held excessively but handed one or two good shots while Jack landed many. In round four, the three-knockdown rule was applied to give Jack the KO win. The last knockdown looked like more of a headbutt than a clean knockdown, but Colina did not complain when referee Frank Santore Jr. waved off the fight. Now 24-3-3, Jack said he would like to move up from light heavyweight to cruiserweight.