The Brit recorded victory in their marathon three-setter at the World Tour Finals in London in November but Nishikori scored a momentous upset when he knocked Murray out of the U.S. Open last summer at the quarterfinal stage, 1-6, 6-4, 4-6, 6-1, 7-5.
Murray largely dispensed with the chuntering and lapses that accompanied his first two matches as he maintained the momentum established in beating Juan Martín del Potro with an assured display on Court Philippe Chatrier.
The No. 1-seeded Murray, a three-time major champion and last year's runner-up at Roland Garros, and No. 3 Wawrinka, whose own trio of Grand Slam trophies includes the 2015 French Open, moved into the quarters with ho-hum, straight-set victories.
The eighth-seeded Nishikori recovered from a nightmare opening set to beat Fernando Verdasco 0-6, 6-4, 6-4, 6-0 on Monday (Tuesday, Manila time) and progress to his seventh Grand Slam quarterfinal, a record for a Japanese man.
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Cilic advanced as Kevin Anderson retired hurt with a leg injury, when trailing the Croat 6-3, 3-0. Paris has also had some problems in the past year or two. "I'm feeling good going into the middle part of the second week and I've come a long way in the last 10 days or so".
The world number 97 had only won one match at the majors before this year's Roland Garros but she was the better player in the first set with Pliskova hitting just four winners. "I managed to push her back".
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"I just try to find myself into this zone where I don't do much unforced errors", the Ukrainian said, "and still play aggressive".
"But he has found himself, he has found himself in the right moment - when you're the top seed, last year's finalist and you want to win".
Svitolina rallied to beat Croatian qualifier Petra Martic 4-6, 6-3, 7-5 on Court Suzanne Lenglen. "They gave me the energy to fight". Dominic Thiem remains the only player to beat Rafael Nadal on clay this season, but the Austrian's shock win at the Rome Masters was swiftly followed by a 6-1, 6-0 humiliation against Djokovic.
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Thursday, Trump griped he was receiving unfair treatment from investigators compared with his election opponent, Hillary Clinton . The Twitter attacks came as Vice-President Mike Pence hired a personal lawyer to represent him in the intensifying investigation.