4x400

U.S. men hold off Jamaica for Olympic gold in 4x400-meter relay
The U.S. men's 4x400-meter relay held off a late challenge by Jamaica to rebound and win gold in the event, a day after the Americans' 4x100 relay men's team was disqualified.
U.S. women's team wins sixth straight gold in 4x400-meter relay
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U.S. women's team wins sixth straight gold in 4x400-meter relay