Novak Djokovic of Serbia celebrates after winning the final match against Denis Shapovalov of Canada at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France, Nov. 3, 2019. (Photo: Xinhua)

Novak Djokovic of Serbia celebrates after winning the final match against Denis Shapovalov of Canada at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France, Nov. 3, 2019. (Photo: Xinhua)

Novak Djokovic of Serbia celebrates after winning the final match against Denis Shapovalov of Canada at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France, Nov. 3, 2019. (Photo: Xinhua)

Novak Djokovic of Serbia celebrates after winning the final match against Denis Shapovalov of Canada at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France, Nov. 3, 2019. (Photo: Xinhua)

Novak Djokovic of Serbia celebrates after winning the final match against Denis Shapovalov of Canada at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France, Nov. 3, 2019. (Photo: Xinhua)