Marcos Maidana stuns Adrien Broner in unanimous decision

Also, Beibut Shumenov stopped Tomas Kovacs in the third round to retain his WBA super light-heavyweight championship. Shumenov, from Kazakhstan, improved to

Marcos Maidana shockingly dominated Adrien Broner in his unanimous win in San Antonio :: Ronald Martinez/Getty Images

Also, Beibut Shumenov stopped Tomas Kovacs in the third round to retain his WBA super light-heavyweight championship. Shumenov, from Kazakhstan, improved to 14-1. Kovacs, from Slovakia, dropped to 23-1.