Eunice Jepkoech Sum of Kenya (R) celebrates winning the women's 800 metres final ahead of Ekaterina Poistogova of Russia (L) and second place finisher Mariya Savinova of Russia (2nd L) as Alysia Johnson Montano of the U.S. falls to the ground during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow August 18, 2013. REUTERS/Gary Hershorn (RUSSIA - Tags: SPORT ATHLETICS TPX IMAGES OF THE DAY)