Serb has made semi-finals in all four grand slams
He has struggled physically at the end of the majors
Novak Djokovic has admitted he is unsure of how physically ready he will be for his US Open semi-final against Carlos Alcaraz but is determined to do all he can to give himself the best chance against the Spaniard when they face each other on Friday.
Djokovic reached the last four late on Tuesday night with a tremendous 6-3, 7-5, 3-6, 6-4 win against the fourth seed Taylor Fritz. Although Djokovic found himself under constant pressure in his service games and at times was outplayed by his American opponent, he showed his peerless mental toughness by saving his best level for the most important moments as he eked out a victory in four sets.
The win set up another meeting with Alcaraz, the second seed and French Open champion, who eased into the semi-finals with a straight-sets win over Jiri Lehecka.
