Canelo Alvarez suffered a surprise defeat on Saturday as Russia's Dmitry Bivol successfully defended his World Boxing Association light heavyweight title with a win by unanimous decision at Las Vegas' T-Mobile Arena.

All three judges scored the fight 115-113 in Bivol's favor at the end of 12 rounds as the Mexican was handed only the second loss of his career, nine years after he was beaten by Floyd Mayweather in November 2013.

Bivol silenced the sellout crowd to take his record to 20 wins from 20 fights while Alvarez, widely considered the best pound-for-pound fighter in the world before the bout, slipped to 57-2-2.