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July 5, 2015

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United States relay team, from left, Kind Butler, David Verburg, Calvin Smith and Kyle Clemons celebrate after winning the 4x400m relay with a new world record during the Athletics World Indoor Championships in Sopot, Poland, on Sunday, March 9.

Petr David Josek / AP

United States relay team, from left, Kind Butler, David Verburg, Calvin Smith and Kyle Clemons celebrate after winning the 4x400m relay with a new world record during the Athletics World Indoor Championships in Sopot, Poland, on Sunday, March 9.