United States' Tianna Bartoletta, left, and Jamaica's Veronica Campbell-Brown compete in a women's 60m heat during the Athletics Indoor World Championships in Sopot, Poland, Saturday, March 8, 2014. (AP Photo/Matt Dunham)
United States' Ashton Eaton prepares a pole vault attempt in the men's heptathlon during the Athletics Indoor World Championships in Sopot, Poland, Saturday, March 8, 2014. (AP Photo/Matt Dunham)
Jamaica's Veronica Campbell-Brown competes in a women's 60m heat during the Athletics Indoor World Championships in Sopot, Poland, Saturday, March 8, 2014. (AP Photo/Matt Dunham)