Roger Federer says he’s over his lung infection and is not counting out the possibility of winning the calendar year Grand Slam.

The Swiss said he's not specifically aiming for the feat, but can envision doing it. “I can't prepare in a different way just to win the Grand Slam,” he said. “It's something that's going to happen or not. I've been a few sets away of doing it, and that's, for me, is almost good enough already. But I'll definitely give it another try.

"The preparation for clay will be perfect for the French Open. Wimbledon, it would be perfect if the French wasn't there, but I'm not going to do what Lendl did, because I've been able to win back-to-back French and Wimbledon, so I know I can do it again.  At the U.S. Open, I'll be well-prepared. I hope physically I'll hold up. Mentally it's not going to be a problem.  It's an exciting year ahead of me.”