He buckled at 5-5 and sent a backhand long on break point, leaving del Potro to serve for the match, which he did easily as Cilic sent three more backhands out. That said, Thiem has already been at a high level for a long time and he'll be used to this situation. But I get closer to them, just asking who was it?
Nadal, meanwhile, lost his first set at the French Open since 2015 but that blip did not stop him marching into the semi-finals with a 4-6 6-3 6-2 6-2 victory over Diego Schwartzman. "Second thing, if you don't feel the pressure, it's because you don't love the sport", said Nadal, who has never failed to win the title in Paris after reaching the semi-finals. It marks the world No. 6's first French Open semifinal since 2009.
Nadal's streak of 37 consecutive set wins at Roland Garros ended Wednesday, but with victory the 32-year-old became only the third player in the Open era (since 1968) to reach 11 semifinals in the same grand slam.
Del Potro said resuming a match at 5-5 in a tiebreak with his serve to come had been a odd situation but his aim was true and he moved 6-5 ahead before his cagey backhand slice induced a poor forehand error by Cilic.
For his hard work, Del Potro gets a semifinal showdown with Rafael Nadal on Friday. "That's the most important for me". "And when I was able to change that, I was able to win the game and the match". Although he lost, the run set off a string of strong play that led him to his first (and only) Grand Slam title, at the 2009 US Open.
Nadal has lost one match on clay this year and won his 11th titles at Monte Carlo and Barcelona along with an eighth trophy in Italy.
"I have very little to lose in a semi-finals in a Grand Slam".
"It's tough to speak now", del Potro said.
Both men's matches already had been interrupted by rain once.
Twice the runner-up in Paris, Halep has qualified for the final by defeating 2016 champion Garbine Muguruza 6-1, 6-4.
It would take a superhuman effort from Del Potro - a serving masterclass, pulverising groundstrokes and acute focus over five sets - to have a chance at dethroning the King of Clay.
Dabrowski, a 26-year-old from Ottawa, and Pavic dropped the first set against Taiwan's Latisha Chan and Croatia's Ivan Dodig 6-1 but came back to win the second 7-6 (5).
"And today I moved forward, and I had a better backhand".
We're nearly to the end of the French Open for 2018.