(Reuters) - Mexican Saul ‘Canelo’ Alvarez will fight Callum Smith at a yet to be confirmed venue in the United States next month with Britain’s WBA world super-middleweight title at stake. “I’ll be returning to the ring on December 19th to face Callum Smith,” Alvarez said on social media, with the fight to be shown on subscription streaming service DAZN. Alvarez has been a world champion in four weight divisions. Smith, 30, won the title from compatriot George Groves in Saudi Arabia in September 2018 and remains unbeaten in 27 fights.