High-speed crash

South Korea's Kim Hyunsung, below, collides hard with Brazil's Rafael Pereira Da Silva as they compete for a 50-50 ball during their semifinal match at the London 2012 Olympic Games.

( Andrew Yates / AFP/Getty Images / August 9, 2012 )

South Korea's Kim Hyunsung, below, collides hard with Brazil's Rafael Pereira Da Silva as they compete for a 50-50 ball during their semifinal match at the London 2012 Olympic Games.

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