Rafael Nadal admits he does not know whether he will be fit to face Nick Kyrgios in Friday's Wimbledon semi-finals after an abdominal injury nearly forced him to quit against Taylor Fritz.
The second seed had to take a medical time-out in the second set but battled through to win 3-6, 7-5, 3-6, 7-5, 7-6 (10/4) in a gruelling contest lasting four hours and 21 minutes.
Earlier, Australian maverick Kyrgios cruised past Chile's Cristian Garin with relative ease 6-4, 6-3, 7-6
(7/5).
Nadal, the 2008 and 2010 champion, said in his post-match press conference that he was unsure over his ongoing participation in the tournament as he targets the third leg of a rare calendar Grand Slam.
"I can't give you a clear answer because if I gave you a clear answer and tomorrow another thing happens, I will be a liar," said the 36-year-old.
Nadal, who was given pain relief during the match, said he would have tests before deciding whether to play on at the All England Club.