Karolina Pliskova faced her biggest test of the tournament against an inspired Veronica Cepede Royg of Paraguay, but survived a two-hour battle to complete the comeback victory. It's the first time Karolina reaches the second week in Paris, she has done well at Grand Slam level in the past year: she reached the US Open final and Australian Open quarter-finals.
Pliskova now faces No. 28 Caroline Garcia of France for a semifinal berth.
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. This was his third Grand Slam tournament.
Khachanov is playing at Roland Garros for the first time.
The eighth-seeded Nishikori was leading 7-5, 6-4, 6-7 (4), 0-3 when rain stopped play on Saturday, but was clearly struggling with a wrist injury and had also had treatment on his back as the 21-year-old Chung rallied.
Svitolina, who needed treatment on her back at the start of the third set, won on her second match point when Martic hit a backhand into the net.
Wenger Agrees Fresh Two-year Contract at Arsenal
Wenger , if all goes according to plan, will sign a new two-year contract at the club's board meeting on Tuesday. I love to build, I love to get people going and I love what I do. "I've played until the end of my contract".
She followed that up by making the quarter-finals of the Australian Open and winning a title in Doha.
The Czech is the second seed in a wide open women's field but has struggled to translate her results on hard courts to clay.
Chung, who is ranked 67th, had never beaten a top-10 player in six attempts but leveled when play resumed, keeping alive his bid to become the first South Korean to reach the fourth round at Roland Garros.
While the men's side of the singles tournament in the 2017 French Open at Stade Roland Garros in Paris was a little more chaotic on Friday, June 2, the women's singles tournament was a little more calm.
The 15th-seeded Monfils moved into the fourth round at the French Open for the seventh time.
Andy Murray, last year's runner-up, is also on Chatrier.