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London 2012 - Tianna Madison, Allyson Felix, Bianca Knight and Carmelita Jeter raced away from their closest challengers Jamaica to take gold for the United States in a world record time of 40.82. Watch highlights of the thrilling final now.

4x100m relay,Athletics,London 2012,United States of America,Women,
IOC - Team USA break 4x100 Relay world record - highlights
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