Novak Djokovic came to a sentimental realization about Rafael Nadal's retirement following his second round French Open victory.

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,

Seeing Nadal, Federer and Murray all retire in the last few years has prompted Djokovic to think more about his own mortality.