Canelo Alvarez held off a feisty challenger Saturday night, proving to be the stronger and more effective boxer to retain his undisputed super middleweight championship, winning by unanimous decision to hand Jaime Munguia his first loss. Alvarez (61-2-2), who closed as a minus-380 at BetMGM, overcame a somewhat slow start to dominate Munguia (43-1) before a crowd of 17,492. The champ took full control after knocking down Munguia in the fourth round.