Eunice Jepkoech Sum (R) of Kenya reacts as she wins ahead of Ekaterina Poistogova and Mariya Savinova of Russia and Alysia Johnson Montano of the U.S. (L-2R) in the women's 800 metres final during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 18, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: SPORT ATHLETICS)