For a long time, men's tennis was dominated by "the big three": Roger Federer, Rafael Nadal, and Novak Djokovic. But while Federer and Nadal have retired, Djokovic is still going — and giving younger players a run for their money. At 38, Djokovic plays in Grand Slams alongside the next generation of men's tennis stars, including 22-year-old Carlos Alcaraz , Jannik Sinner, 24, and Taylor Fritz, 28. And they're yet to break his 428-week streak as World No. 1 in the ATP rankings. Djokovic has a