Jul 27, 2014; Eugene, OR, USA; Members of the United States mens and womens 4 x 400m relays pose after winning gold medals in the 2014 IAAF World Junior Championships at Hayward Field. Front row (from left): Olivia Baker and Shamier Little and Kendall Baisden and Shakima Wimbley. Back row: Ricky Morgan and Josephus Lyles and Michael Cherry and Tyler Brown. Mandatory Credit: Kirby Lee-USA TODAY Sports