Halep crushed Suarez 6-1, 6-1, in one hour.
Svitolina did not do too much wrong, with the credit going to Halep for some fantastic defence and courageous play. But from 5-1 in that first set, it was just really, really painful and just wasn't going away.
"It's going to be a very different match than today, it's going to be like playing the ball machine", Halep, who leads Pliskova 4-1 in head-to-heads, said.
Cilic was leading 6-3, 3-0 against Kevin Anderson when the unseeded South African pulled out with a left thigh injury. In the French Open 2017 so far, Suarez Navarro averages 19 unforced errors per match whereas Halep averages 16 unforced errors per match. Monfils lost to 2015 champion Stan Wawrinka 7-5 7-6 (9-7) 6-2.
The loss marked the end of Chan Hao-ching's French Open after the Taiwanese and Jean-Julien Rojer of the Netherlands fell to a 6-3, 3-6, 10-6 defeat to Casey Dellacqua of Australia and Rajeev Ram of the United States in the second round of the mixed doubles on Sunday.
Fifth seed Svitolina had looked well-set to become the first Ukrainian woman to make a Grand Slam semi-final.
Nishikori, who lost to Jo-Wilfried Tsonga in his only other quarterfinal appearance at Roland Garros, will next face top-ranked Andy Murray. A first-time Grand Slam champion will be crowned on Saturday and the victor could well be the one who survives this match.
Murray played cleanly to beat 53rd-ranked Karen Khachanov of Russian Federation 6-3, 6-4, 6-4 on Court Philippe Chatrier.
This marks Murray's seventh overall trip to the round of eight at Roland Garros.
"Obviously it's a awful tragedy in London", Murray, who recorded his 650th career win, told the crowd. "To beat him for the first time in the quarter-final of a grand slam.it's a dream", said Thiem.More news: Last Kmart in Sacramento to close
Martic, ranked 290th, served for the match at 5-3 on Court Suzanne Lenglen but was broken by Svitolina.
Paris-based Svitolina, one of the tournament favourites, next faces Romanian Simona Halep who she beat in the Italian Open final in Rome last month.
Of all the quarter-finalists, none of whom had won a major, Halep looked the more likely champion with her claycourt pedigree and a run to the 2014 final when she was beaten by Russian Maria Sharapova.
Another straight sets win followed over Magda Linette, before she again had to bounce back against Petra Martic, only taking the third 7-5 with the pressure getting to Linette on serve.
That's what Halep did in her quarterfinal match against an opponent who has been the most successful WTA player on the year, Elina Svitolina.
Pliskova reached the U.S. Open final a year ago but had never been past the second round in five previous appearances in Paris.
- Nadal has progressed past the last eight for the 10th time and is seeking to win his 10th title.