In the French Open, World no. 2 Swiss Tennis player Roger Federer will take on his compatriot Stanislas Wawrinka in the men's singles while Ana Ivanovic of Serbia will clash with Ukrainian Elina Svitolina in women's singles today for a place in the semifinals. Rafael Nadal of Spain will face World No. 1 Novak Djokovic of Serbia in the Men's Singles quarterfinals Tomorrow. Djokovich advanced to the last eight stage by defeating French player Richard Gasquet 6-1, 6-2, 6-3 while Nadal reached quarterfinals after beating American Jack Sock 6-3, 6-1, 5-7, 6-2 at Roland Garros last night. In a surprising development in women's category yesterday, defending champion Maria Sarapova was knocked out of the tournament. The Russian was beaten 7-6 (7-3) 6-4 by 13th seed Czech player Lucie Safarova in the fourth round. However top seed Serena Williams survived a big scare to reach the quarter-finals. Serena defeated fellow American Sloane Stephens 1-6, 7-5, 6-3.