She (Garcia) played very well, we were both serving well.
In fact, Svitolina re-marched the mountain all the way back to a match point in the breaker, which ended up being the pivot point of the match, as she took the set on a lucky netcord en route to dishing out a bagel to an understandably stunned Svitolina.
Thursday's other women's semifinal sees 2015 French Open semifinalist Timea Bacsinszky play Wimbledon junior victor Jelena Ostapenko. And on clay I never won against her, so it was a really good match.
Wawrinka, who won at Roland Garros in 2015, will face either top-ranked Andy Murray or No. 8 Kei Nishikori.
But Svitolina, who needed treatment on her back at the start of the third set, broke and soon won on her second match point, when Martic hit a backhand into the net.
The third seeds did not face a single break point and converted five of six to stretch their winning streak to 11 matches, including the titles in Madrid and Rome, and set up a quarter-final against Raluca Olaru of Romania and Olga Savchuk of Ukraine.
Pliskova reached the U.S. Open final a year ago but had never been past the second round in five previous appearances in Paris.
She only needed one, winning with a crosscourt forehand victor.
7 - Roland Garros quarter-finals Murray has now reached to take sole ownership of fourth place among active players with the most last-eight appearances at the French Open.
Halep struck 19 winners in 60 minutes of play on Court Philippe Chatrier to return to the last eight in Paris for the second time in her career.
Garcia, victor of a fiery duel with compatriot Alize Cornet in the previous round, seemed to wilt in the second set, unable to match her Czech opponent.
Simona Halep admitted yesterday she was "ashamed" that her on-court behaviour prompted respected coach Darren Cahill to call a temporary halt to their partnership. But it wouldn't surprise me if we had a different Grand Slam champion in Wimbledon, and maybe even at the US Open. Kevin Anderson has served a staggering 58 aces in French Open 2017 so far, including 24 aces in his previous round victory against Kyle Edmund.
Cilic was leading 6-3, 3-0 against Kevin Anderson when the unseeded South African pulled out with a left thigh injury. Nevertheless, Garcia stepped up and continued to attack the vulnerable second serves of Pliskova, coming up with an impressive return victor on her second break point to grab the break back and level the scores after all the hassle.