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The United States closed Saturday night in the pool with a win in the 4x100-meter mixed medley relay.
Torri Huske held on in the final leg of the four-discipline race to give the Americans the world record in the event and their sixth gold medal in the swimming events.
Huske, who swam the freestyle leg, combined with Ryan Murphy, Nic Fink and Gretchen Walsh to win the event.
China finished eight-hundredths of a second off the United States' pace, while Australia settle for third.
Results
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