While Novak Djokovic plays, he often yells at his player's box. "They keep me sharp, I keep them sharp," Djokovic a few years ago during the U.S. Open. "I demand the most focus from my team and they do the same for me.

Three weeks ago, following a heartbreaking semifinal exit at the French Open, Novak Djokovic dropped a bombshell about his future in professional tennis, suggesting it might have been his final appearance at Roland Garros.