Novak Djokovic crashed out of the French Open and then cast doubt over whether he will play at Wimbledon.
The 12-time Grand Slam winner was stunned in the quarter-finals at Roland Garros by world No 72 Marco Cecchinato.
Italian Cecchinato won in four sets, scrambling over the line in an epic tie-break on his fourth match point.
Afterwards a dazed Djokovic, who has struggled with injury for much of the last year, was asked when he planned to make his first grass-court appearance.
He replied: "I don't know. I don't know if I'm going to play on grass. I don't know. I don't know what I'm going to do. I just came from the court. Sorry, guys, I can't give you that answer. I cannot give you any answer.
"How do I regroup? I don't know. I'm just not thinking about tennis at the moment."
The Serbian needed lengthy treatment on a neck problem after dropping the first set.
Cecchinato had not won a single Grand Slam match until he arrived at Roland Garros, but the 25-year-old is now the first Italian to reach the semi-final since Corrado Barazzutti 40 years ago after sealing a famous 6-3 7-6 (7-4) 1-6 7-6 (13-11) victory.
He said: "Maybe I'm sleeping. It's amazing. It's unbelievable for me. For me to beat Djokovic in a quarter-final at Roland Garros it's amazing.
"For me, it's the first time semi-final grand slam. Now I need to think for the semi-final and I need some rest for recovery. I am very happy."