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
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'