Without question, Roger Federer is going to go down as one of the greatest tennis players of all time. His résumé is unlike that of anyone else who’s played the sport: he has won 19 Grand Slam singles titles, held the #1 in the ATP rankings for a record total of 302 weeks, and ranked №1 for a record 237 consecutive weeks.

But as the saying goes: age catches up with everyone, and father time remains undefeated.

Coming off a 2016 tennis season in which Federer turned 35 years old, it appeared that he was heading into the twilight of his career. He was plagued by various injuries to his knee and back, and shut things down about this time last year, to spend the remainder of the year recovering and spending time with family. That hiatus ended his run of 65 consecutive Grand Slam appearances, and subsquently caused him to drop out of the top 10 rankings since 2002.

And yet, amidst that backdrop, like any great champion, it looks like Federer has one last “round” to give to the sport. Fast forward to one year later, and Federer went from a ranking as low as 17th in the world, all the way back up to #3. Returning from his time off, he went on to win the 2017 Australian Open, defeating arch rival Rafael Nadal for the first time in a Grand Slam event since the 2007 Wimbledon final. He followed that up by winning the 2017 Wimbledon tournament, extending his own record to a 19th victory in a major event, and became the first male in 40 years to win at Wimbledon without dropping a set.

So, the man we had all once written off as a champion of yesterday could actually head into the 2017 US Open tournament as one of the favorites to win it. Every time Federer has won both the Australian Open and Wimbledon in a single season, he has also gone on to lift the US Open trophy (2004, 2006 and 2007).

Of course, even with a staggering 93.9% match win percentage this year, the 35-year-old Federer is downplaying his chances of making it three straight Grand Slam victories. He knows that, given the hot streak he’s riding right now, if he can maintain his conditioning, he has a chance to play really well in New York. But at the same time, he’s very cognizant of the fact that he’s not getting any younger, and that winning three grand slam events at his age would be very difficult.

Yet Federer ended his five-year drought without a Grand Slam victory in resounding fashion this year, and he’s still as close to a “living legend” as the professional tennis game has right now. It would be wise for anyone not to bet against him.