Yes, that looked quite concerning at the end. His movement had looked a bit sluggish but on the final point he came into net and hit two good volleys to win the point. He then walked very slowly back to the baseline before bending over and not moving for quite a while. He eventually conceded the match but rather than walk back to his chair he just stayed at the back of the court for a long time before eventually someone brought a chair to him. Someone did seem to wipe the court where he had been standing so perhaps he was not injured but was ill and had been sick on court, whatever it was he was clearly in discomfort.