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Andy Murray recorded a straight-sets defeat of John Isner at the French Open, following a shock win for Albert Ramos-Vinolas over Milos Raonic.
Isner provided second seed Murray with a significant challenge but the Scot had the discipline and composure to get the better of the American at crucial stages.
Murray secured a 7-6 (11-9), 6-4, 6-3 win to progress to a quarter-final meeting with either either fifth seed Kei Nishikori or ninth seed Richard Gasquet.
Ramos-Vinolas also won in three sets, ending eighth seed Raonic's participation in the tournament.
The unseeded Barcelona man produced some vicious hitting on his way to a 6-2, 6-4, 6-4 triumph , reaching his maiden Grand Slam quarter-final in the process.
The 28-year-old will face defending champion Stan Wawrinka in the last eight, with the Swiss third seed having defeated Viktor Troicki 7-6 (7-5), 6-7 (7-9), 6-3, 6-2.
"I played a great match," said Ramos-Vinolas following his surprise win.
"I think the cloudy conditions helped me, as they made the court slower.
"It was a great day. I played solid and put a lot of first serves in. These are very good days."
In the women's competition, Garbine Muguruza eased past former champion Svetlana Kuznetsova to set up a clash with Shelby Rogers.
Kuznetsova, the 2009 victor, was outplayed by her 22-year-old opponent, who won 6-3, 6-4.
Rogers triumphed by the same scoreline, defeating Romania's Camelia Begu.
The unseeded American has never before reached the last eight of a Grand Slam tournament.
French Open results, Men's Singles Fourth Round, 29 May
Albert Ramos-Vinolas (SPA) beat Milos Raonic (CAN) (8): 6-2, 6-4, 6-4
Stan Wawrinka (SUI) (3) beat Viktor Troicki (SRB) (22): 7-6 (7-5), 6-7 (7-9), 6-3, 6-2.
French Open results, Women's Singles Fourth Round, 29 May
Garbine Muguruza Blanco (SPA) (4) beat Svetlana Kuznetsova (RUS) (13): 6-3, 6-4
Shelby Rogers (USA) beat Camelia Begu (ROU): (25) 6-3, 6-4