Middleweight boxer Canelo Alvarez of Mexico and WBC/WBA/IBF middleweight champion Gennady Golovkin of Kazakhstan pose during a news conference at MGM Grand hotel and casino in Las Vegas, Nevada, U.S., September 13, 2017. REUTERS/Las Vegas Sun/Steve Marcus
Saul Alvarez, left, and Gennady Golovkin are scheduled to fight a rematch in May but Alvarez's recent failed doping tests have put the fight in doubt. Steve Marcus / Reuters

Golovkin and Alvarez rematch confirmed for May 5: 'This is the fight the world wants'