BEIJING — The Dutch won the 400-meter freestyle relay with an Olympic-record time of 3:33.76, beating the old mark of 3:35.94 set four years ago by Australia.

Natalie Coughlin, adding to the five medals she won in Athens, took the leadoff leg for the Americans, and was followed by Lacey Nymeyer, Kara Lynn Joyce and Dara Torres.

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