Roger Federer and Novak Djokovic are two of the greatest tennis players in history. But who is the best? A former World No. 7 player and Olympic gold medalist has the answer.

Novak Djokovic now holds another Grand Slam record as he officially surpassed fellow tennis legend Roger Federer on Wednesday when he played the 430th major match in his career. After Djokovic's first-round match at the Australian Open on Monday,

MELBOURNE, Australia (AP) — Novak Djokovic added yet another record to his lengthy list, breaking a tie with Roger Federer for the most Grand Slam matches played in tennis history by reaching 430 on Wednesday at the Australian Open in what was a tougher-than-expected second-round victory.