Rafael Nadal uncertain about future despite victory over Novak Djokovic

Rafael Nadal is into the semi-finals (Christophe Ena/AP)

Rafael Nadal may be rolling back the years at Roland Garros, but a chronic foot injury means the king of clay cannot look beyond this year’s French Open.

Nadal beat his arch-rival, the world number one and defending champion Novak Djokovic, in a late-night classic on Tuesday.