By Tom Victor Canelo Alvarez defended his undisputed super-middleweight title against Jaime Munguia, but was taken the distance in Las Vegas before winning by unanimous decision. The Mexican, who had just two defeats from 64 bouts going into the match-up at T-Mobile Arena, didn’t have everything his own way in the opening rounds. However, he took charge after knocking Munguia down for the first time ever when he landed an uppercut in round four. Fellow Mexican Munguia went into the fight as the reigning WBC Silver super middleweight champion, having defended that title against John Ryder in Ja…