Roger Federer pulled out of ATP tournament in Miami . Top seed defeated 6 - 3 6 - 4 by Daniel Brands of Germany . Former No.1 Federer lost in second round of title defense at Wimbledon . Revealed he has been suffering with back problems .
Roger Federer crashes out of ATP tournament in Gstaad . Top seed beaten 6-3 6-4 by Daniel Brands of Germany . Former No.1 Federer lost in second round of title defense at Wimbledon . Revealed he has been suffering with back problems .