Roger Federer closed the curtain on his 2016 season last month, but he's already preparing for his 2017 comeback.
Watch: Federer's Throwback
The 17-time Grand Slam champion looks fit in this Instagram video of a recent serving practice he shared along with the caption: "Practice makes PeRFect."
Federer pulled the plug on his 2016 season to rehab his surgically-repaired left knee.
In a Facebook post announcing his decision last month, the 35-year-old Federer said he needs "extensive rehabilitation" following knee surgery to repair a torn meniscus in February.
"I have made the very difficult decision to call an end to my 2016 season as I need more extensive rehabilitation following my knee surgery earlier this year," Federer said. "The doctors advised that if I want to play on the ATP World Tour injury free for another few years, as I intend to do, I must give both my knee and body the proper time to fully recover. It is tough to miss the rest of the year."
Still, that doesn't mean Federer won't visit New York this month. There is speculation he will likely visit the US Open to fulfill some sponsorship obligations.
In the meantime, here's a glimpse of Federer with some fellow Nike stars prior to the 2015 US Open.
Photo credit: Gerry Weber Open