Novak Djokovic is opening up about his relationship with fellow tennis stars Roger Federer and Rafael Nadal, admitting that it's often strained.

MELBOURNE, Australia — And then there was one: The Big Three is down to just Novak Djokovic, who stands alone from a golden generation of men’s tennis now that Rafael Nadal has joined Roger Federer in retirement.

But there are five champions who have marked the history of recent tennis: Tennis World USA offers this interesting analysis and the ranking of finals played at least 5 times taking the Open Era as a