Roger Federer and Kei Nishikori lost their quarterfinal matches on Tuesday at the 2015 French Open. In blustery conditions at Suzanne Lenglen, the world no.2 was eliminated by his pal and Davis Cup teammate Stan Wawrinka, who packed too much power in his shot-making and left Federer stranded on several occasions. This is the third straight year that Federer has made a quarterfinal exit at Roland Garros. In the other quarterfinals, Jo-Wilfried Tsonga gladdened the French hearts by defeating Japanese Kei Nishikori in a five-set thriller. The Frenchman has made to