China's Zhilei Zhang, right, fights Australia's Johan Linde during a super heavyweight over 91-kg preliminary boxing match at the 2012 Summer Olympics, Wednesday, August 1. AP

Zhilei Zhang reacts after being declared the winner over Johan Linde. AP

Johan Linde reacts after losing to Zhilei Zhang. AP

Cuba's Erislandy Savon Cotilla, left, fights Great Britain's Anthony Joshua, during their men's super heavyweight over 91-kg boxing match at the 2012 Summer Olympics, Wednesday, August 1. AP

Erislandy Savon Cotilla, left, fights Anthony Joshua. AP

Erislandy Savon Cotilla, left, fights Anthony Joshua. AP

Canada's Simon Kean, right, fights France's Tony Yoka, during their men's super heavyweight over 91-kg boxing match at the 2012 Summer Olympics, Wednesday, August 1. AP

Simon Kean, left, fights Tony Yoka. AP

Kean, right, has his mouthpiece knocked out during his fight against Yoka. AP

Kean, right, is declared the winner over Yoka. AP