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. From left: Shakima Wimbley and Tyler Brown and Michael Cherry and Olivia Baker and Shamier Little and Josephus Lyles and Kendall Baisden and Ricky Morgan. Mandatory Credit: Kirby Lee-USA TODAY Sports