Calvin Smith takes the baton from Kind Butler in the 4x400m at the 2014 IAAF World Indoor Championships in Sopot (© Getty Images)
The USA quartet of Kyle Clemons, David Verburg, Kind Butler III and Calvin Smith set a world indoor record* of 3:02.13 in the men's 4x400m relay at the IAAF World Indoor Championships Sopot 2014 on Sunday (9).
The USA team will receive a world record bonus of US$50,000.
*subject to the usual ratification procedures
More to follow