Novak Djokovic beats Tomas Berdych in a third-set tie-break in Group A opener . `` I have n't been able to do too much training this week . The Serb will face either Roger Federer or Rafael Nadal for the title. Fifth seed David Ferrer upsets home hope Andy Murray in Monday 's first game . World No . 3 Murray struggling with groin injury and may quit the tournament .
Novak Djokovic beats Tomas Berdych in a third-set tie-break in Group A opener . The Serb will face either Roger Federer or Rafael Nadal for the title. Fifth seed David Ferrer upsets home hope Andy Murray in Monday 's first game . World No . 3 Murray struggling with groin injury and may quit the tournament .