Rafael Nadal admits it is unlikely he will emulate great rival and friend Roger Federer and play into his 40s.
Nadal, 36, gets his Nitto ATP Finals campaign underway in Turin against Taylor Fritz on Sunday as he eyes his first success in the competition, 17 years after he first qualified back in 2005.
He has overcome a series of injury problems over the course of his career and insists he is still enjoying his tennis as he enters the twilight of his career. Asked if he will follow in the footsteps of Federer, who retired at 41 earlier this year, Nadal told reporters: "I don't know, I can't predict the future.
