Gennady Golovkin, left, blocks a shot from Saul 'Canelo' Alvarez during the world middleweight boxing championship at T-Mobile Arena in Las Vegas. The bout ended in a draw. Joe Camporeale / USA Today
Gennady Golovkin, left, blocks a shot from Saul 'Canelo' Alvarez during the world middleweight boxing championship at T-Mobile Arena in Las Vegas. The bout ended in a draw. Joe Camporeale / USA Today

Alvarez and Golovkin promise fireworks in Cinco de Mayo rematch