The rematch between Katie Taylor and Amanda Serrano was as bloody and bruising as the original. Taylor retained her unanimous super lightweight championship in a razor-thin unanimous decision over Serrano on Friday night in a slugfest remarkably similar to their epic bout in New York two years ago. Taylor was scored a 95-94 winner by all three judges, drawing boos from the crowd at the home of the NFL's Dallas Cowboys before the co-main event of Jake Paul and Mike Tyson.