U.S. faces challenges in repeating Beijing gold in 4x100 free

LONDON - Not including the U.S.-boycotted 1980 Moscow Games, the American men's 4x100 relay team has won a medal in the event at every Olympics since the event debuted in 1964. There were seven straight golds, then a silver in 2000, a bronze in 2004 and then, thanks to Jason Lezak, maybe the best-ever gold in Beijing in 2008. The U.S. men face the most direct of challenges in 2012.

Not just to win.

But -- to medal.

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