Roger Federer says it was a combination of different factors that led him to crash out of the French Open on Tuesday. It was an all-Swiss showdown when Federer clashed with Stan Wawrinka in the tournament's quarter-final, with Wawrinka defeating the 2009 champion 6-4 6-3 7-6. The 30-year-old will now face Jo-Wilfried Tsonga in the semi-final
Roger Federer: Wawrinka made French Open quarter-final tough – video
