As his tennis contemporaries continue to head off into retirement, Novak Djokovic is being faced with the reality that his time on the professional courts, too, will come to an end.  Ahead of his first-round matchup with American Mackenzie McDonald on Tuesday at the French Open,

Novak Djokovic experienced the lowest of lows — pulling out of the French Open after tearing the meniscus in his right knee — and the highest of highs — winning a long-sought Olympic gold medal for Serbia — at Roland-Garros last year.

Roger Federer, Novak Djokovic and Andy Murray have shown up at the French Open to participate in a ceremony honoring 14-time tournament champion Rafael Nadal.