The rest of the match was a formality. Federer’s serve degenerated into a stiff, clobbering motion, with no rotation through his back (1:39 in the above video), and no pace either. From the baseline he was clipping balls off the frame of his racket, sending them sailing into the clouds or, on match point, straight down into the court. Federer has never retired from a match in his career, and was clearly just hoping to ride this one out on principle, pick up the runner-up trophy, and then figure out if he was healthy enough to play this week. About an hour ago he made his decision: nope, back injury. He withdrew from Cincinnati, a tournament he has won seven times, in order to recover from whatever went wrong yesterday.

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With the year’s final Slam just two weeks away, he’ll want to take all the time he can to get himself right. It would be a little overzealous to point to Zverev as the U.S. Open favorite—still unknown if his spidery frame can hold up to best-of-five grind, as he has yet to crack the quarterfinal, losing to Nadal (Australian) and Milos Raonic (Wimbledon) in tough five-setters this year. But, with his five title wins this year, he might as well be. Nadal is still around, and is about to reclaim the No. 1 ranking for the first time in over three years. But many of the older threats are busy patching themselves up. After a near-perfect season the GOAT is finally showing signs of mortality again. With the Big Five in disrepair, this could be Zverev’s window to snag a major and kickstart what looks like a very, very lengthy reign at the top of the game.