The German clinched a 6-3, 6-4 win for a place in the quarter-finals, coming good after taking the Swiss star to three sets in Hamburg last week.
Federer said that he has been dealing with the back pain for a few weeks now.
He hinted that he will be taking a late decision on whether or not to play the Montreal Masters, a key US Open warm-up event, which begins a week from Monday on August 5.
“I’ve had serious problems with the back, I had to get some anti-inflammatories last week in Hamburg due to the pain,” he said.
“I will have to do a lot of exercises and see how it all feels. My main priority now is to fix my back. I would love to be able to train at 100 percent.”
Published in The Express Tribune, July 27th, 2013.
Like Sports on Facebook, follow @ETribuneSports on Twitter to stay informed and join in the conversation.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ