United States' Francena McCorory, right, has handed over the baton to Cassandra Tate to win the women's 4x400m relay final during the Athletics World Indoor Championships in Sopot, Poland, Sunday, March 9, 2014. (AP Photo/Petr David Josek)
Jamaica's Shelly-Ann Fraser-Pryce carries the national flag after winning the 60m final during the Athletics World Indoor Championships in Sopot, Poland, Sunday, March 9, 2014. (AP Photo/Petr David Josek)