Novak Djokovic’s knee injury and French Open withdrawal: What it means

Serbia's Novak Djokovic reacts after falling during his French Open fourth-round match against Argentina's Francisco Cerundolo on Monday in Paris. (Yves Herman/Reuters)

The news that Novak Djokovic has withdrawn from the French Open with a torn meniscus was one of those moments at Roland Garros where the gasps were audible.