The seventh - seeded Nalbandian has been forced to retire .
The seventh - seeded Nalbandian had been bothered by inflammation of the right hip for the past couple of weeks and aggravated the injury towards the end of his third - round match against Nicolas Almagro .
The seventh - seeded Nalbandian , who had been bothered by inflammation of the right hip for the past couple of weeks and aggravated the injury towards the end of his third - round match against Nicolas Almagro , has been forced to retire .