Djokovic, who dominated the men's game for three years until he fell off the pedestal last summer, was beaten 7-6 6-3 6-0 by Dominic Thiem, a 23-year-old Austrian who is into the last four for the second year in a row.
Even Djokovic found it hard to fathom how far he's fallen, only a year removed from leaving Roland Garros as a player nonpareil, the first man in almost a half-century to win four consecutive Grand Slam titles.
Virtually unbeatable a year ago, since he finally completed the career Grand Slam at Roland Garros, Djokovic has often looked like a shadow of his former self.
This is the first time Novak Djokovic will lose a set of love in a quarter Grand Slam game since 2005.
Murray said: "When we played previous year, it was a similar situation coming in". So I think he is getting more out of his game than most players.
Thiem thoroughly dominated Djokovic in the quarterfinals, but it is too big of an ask to see him take down Nadal in a best-of-five match.
The Austrian, who is the outstanding clay-court player of the younger generation, said it was "a joke" how tough it was to win a Grand Slam title.
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The attack left seven people dead and dozens wounded before police shot dead the three attackers , who wore fake suicide vests. Fifteen people have been arrested in connection with the incident, but 13 have since been released without charge.
Garbine Muguruza felt she was disrespected by partisan French fans in her loss to Kristina Mladenovic, but Pliskova did not have such issues to contend with in her last-eight win over Garcia.
Thiem moves onto his second French Open semi-final in as many years and will play the red-hot Rafael Nadal.
Wawrinka's been doing his thing, playing good at the Slams and a Masters here or there like Indian Wells, then he also has a few bad losses. He fought well in the first set and had two set points on the Thiem serve at 5-4.
However, the quarter-final exit in Rome might have come as a blessing in disguise for Nadal as the rejuvenated Spaniard has been decimating his opponents enroute to the semi-final. "And at the U.S. Open, I just was emotionally very flat and found myself in a situation that I hadn't faced before in (my) professional tennis career". Stan this tournament has played great.
"I could have used another week", Lendl said.
"At the same way, what's make me more impressed, I don't think right now that this is going to stop on 10".
"He was pushing me all the time, so was tough for me to find any solution", recalled the 32-year-old Wawrinka, the oldest man to reach the semifinals in Paris since Jimmy Connors in 1985.
Thiem's stock rose again with a superb victory over Djokovic, but the Austrian is well aware of how hard it will be to win a first major as he prepares to face Rafael Nadal on Friday.
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