One possible role model for young men is Olympic boxing gold medallist James Degalle, who attended to offer his support.

BBC: 'Save lives, stop the knives'

In men's boxing, defending superheavyweight champion Roberto Cammarelle of Italy narrowly defeated world amateur No. 1 Magomedrasul Medzhidov, of Azerbaijan, 13-12, on points to wrap up a night of semifinal fights.

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Shields's win came one day after the U.S. men's boxing team endured its first medal shutout in Olympic history, failing to send a single member of its nine-man squad into the semifinals here.

WSJ: 2012 London Olympics: Shields Gives U.S. Shot at Boxing Gold