Nathan Adrian of the United States swims in a Men's 100m freestyle heat at the FINA Swimming World Championships in Barcelona, Spain, Wednesday, July 31, 2013. (AP Photo/Michael Sohn)

 

              Nathan Adrian of the United States swims in a Men
Nathan Adrian of the United States swims in a Men's 100m freestyle heat at the FINA Swimming World Championships in Barcelona, Spain, Wednesday, July 31, 2013. (AP Photo/Michael Sohn)