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Marin Clinic thinks tennis will be in good hands when Roger Federer, Novak Djokovic and Rafael Nadal retire.
The trio have won 55 Grand Slam titles between them.
“In London, at the ATP Finals, we got a very clear message: the future of tennis is in good hands,” Cilic said. “After Rafa clinched his year-end number one rankings spot above Novak Djokovic, the younger guys took the main stage at the O2 Arena.
“In the final, Dominic Thiem and Stefanos Tsitsipas fought like veterans and the Greek conquered his biggest career title. Tsitsipas will have an interesting 2020 year, without a doubt.”