Roger Federer crashes out of Shanghai Masters to Gaël Monfils in second round He was swiftly behind in the decider, too, and this time he could not mount a comeback. He had break points to get to 3-4 but they went begging and Monfils served out to love for only his second win in eight matches against Federer. The 32-year-old is still in a decent position to make the World Tour Finals, especially given Andy Murray's withdrawal on Wednesday, but it could well go down to the Paris Masters next month. Jo-Wilfried Tsonga is one of the players with a decent chance to overtake Federer, and he reached the quarter-finals with a 7-6 (7/5) 6-0 victory over Kei Nishikori. Tsonga next meets Germany's Florian Mayer, who upset third seed David Ferrer 6-4 6-3. Ferrer has already booked his place at the O2 Arena but he has struggled for form since reaching the French Open final. Juan Martin del Potro battled with a fever in his second-round match so Tommy Haas' withdrawal with a back injury ahead of their clash was good timing for the Argentinian.