Roger Federer has withdrawn from this week's Paris Masters in order to "pace himself", with next month's ATP Finals in London on the horizon.
The 38-year-old is playing in his 22nd season on the ATP Tour and won a record-extending 10th Swiss Indoors championship title on Sunday.
"I am extremely disappointed to have to pull out," Federer said.
"I want to play as long as possible on the Tour. I'm sorry for my French fans who I'll see at Roland Garros in 2020."
The world number three has already secured a spot in the ATP Finals, which start on 10 November at the O2 Arena.
World number one Novak Djokovic, Rafael Nadal, Daniil Medvedev, Dominic Thiem and Stefanos Tsitsipas are the other five to have guaranteed a place, with the Paris Masters set to determine who clinches the final two spots.
Meanwhile, British number two Cameron Norrie's ATP Tour season ended with a 6-3 6-2 first-round defeat in the French capital against former Wimbledon finalist Milos Raonic.
But the 24-year-old, who is ranked 57th in the world, will be hoping to play again next month by clinching the final spot in Great Britain's squad for the Davis Cup finals in Madrid.
Doubles pair Jamie Murray and Neal Skupski, already assured of their place in Leon Smith's side, reached the last 16 in Paris with a 6-4 3-6 10-7 win over France's Elliot Benchetrit and Corentin Moutet.