Controversial Endings in Boxing History

When Ortiz tried to intentionally head-butt Mayweather late in the fourth round of their welterweight title fight, referee Joe Cortez immediately called time to deduct a point. After the fighters touched gloves several times and moved to the center of the ring, Ortiz looked toward Cortez for a signal to restart. That's when Mayweather stepped back and uncoiled a vicious left-right combination that ended the fight. Unsportsmanlike? Perhaps. Legal? Without a doubt.