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MOSCOW, RUSSIA - AUGUST 15: Broadcaster Lewis Johnson interviews Mary Cain of the United States after she competes in the Women's 1500 metres final during Day Six of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 15, 2013 in Moscow, Russia. (Photo by Christian Petersen/Getty Images)

MOSCOW, RUSSIA - AUGUST 15:  Broadcaster Lewis Johnson interviews Mary Cain of the United States after she competes in the Women's 1500 metres final during Day Six of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 15, 2013 in Moscow, Russia.  (Photo by Christian Petersen/Getty Images)