Federer, winner of a record 19 Grand Slam titles, announced his withdrawal from Paris, the last Masters event of the year, after clinching his 8th Swiss Indoors title in his hometown of Basel on Sunday.
Federer was too good for Del Potro in Basel.
He went on to win the Shanghai Masters and then Basel, but his back has clearly had enough.
"You imagine my disappointment, my frustration".
"I hope to be in such shape when I'm his age".
Federer is skipping Paris after winning back-to-back titles in Shanghai and Basel and is resting to be prepared for the ATP Finals starting in less than a fortnight in London.
"Hopefully if this (number one) happens, it will be something important for me".
The top-ranked Spaniard beat Chung in their only previous encounter on his way to a 10th title at the Barcelona Open in April.
"At 36, we pay more attention than when we have 25".
"When a player, whoever he is, misses this appointment, it weakens the credibility of the circuit". So some are a little diminished.
Here, too, are dangerous non-seeds Richard Gasquet, Diego Schwartzman and John Isner-the last was runner-up last year. Some have had surgery, you can not get them out of their hospital bed.
The hard courts at Bercy will also see the final two places for the World Tour Finals decided, with seven players still hunting a ticket to London.
"My body is asking for a break", said the Swiss legend.
"I'd like to be fully fit for London (the World Tour Finals) and for 2018".
Federer rallied from a break down in the decisive set and clinched when the fourth-seeded Argentine sent a service return long. But Federer bypassed the clay season to recover from his surge through the first quarter of the year, and was then forced to withdraw from Cincinnati with a lingering back problem.
Error! There was an error processing your request. Nicolas Mahut's serve and volley tennis could well undermine Carreno Busta in the second round, while Jeremy Chardy could do the same to hopeful Bautista Agut.
"It would be a snowball". In the quarters, Pouille is scheduled to meet Kevin Anderson-with three wins since the US Open-or Dominic Thiem-just one win since the Davis Cup in September, and a will-he-won't-he be in the draw due to fatigue.
Besides Federer, Nadal, who will compete in Paris Masters, has been in top of his game this season.
He has also captured the Australian Open and Wimbledon titles, as well as Miami Masters, Indian Wells and Halle titles.
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