Saul "Canelo" Alvarez crushed Turkey's Avni Yildirim in three rounds to retain his WBC and WBA super middleweight titles by knockout on Saturday. Mexico's Alvarez dominated underdog Yildirim from the opening bell and sent the Turk crashing to the canvas with a crisp left-right combination in the third round at Miami's Hard Rock Stadium. A weary Yildirim then failed to emerge from his corner for the fourth round as Alvarez bagged the 37th knockout of his career. rcw/bb