Roger Federer, Novak Djokovic and Rafael Nadal have set such a high standard in men's tennis that can very well be unmatchable in the future. Stream NBC 5 for free, 24/7, wherever you are.

Rafael Nadal has named Novak Djokovic and Roger Federer as his toughest opponents throughout his illustrious career, but he's given extra kudos to one rival in particular. Tennis aficionados have ...