Novak Djokovic avoided a shock fourth-round exit at the French Open after fighting back from two sets down against teenager Lorenzo Musetti.
The world number one looked out of sorts before rallying, leading 6-7 (7-9) 6-7 (2-7) 6-1 6-0 4-0 when the Italian, 19, retired with an injury.
World number 76 Musetti, playing in his first Grand Slam main draw, was given a standing ovation as he left the court.
Djokovic will face Italian ninth seed Matteo Berrettini next.
It is the fifth time that Djokovic has overturned a two-set deficit to win at a Slam.