World No.1 Rafael Nadal maintained his bid for an 11th Rolex Monte-Carlo Masters title with a 6-3, 6-2 third-round victory over Karen Khachanov.
The Spanish top seed took just 80 minutes to see off the 21-year-old Russian and reach his 14th consecutive quarter-final at the event.
Nadal will now face Dominic Thiem after the Austrian fought back to dump out Novak Djokovic, playing just his ninth tour match in as many months, 6-7 (2/7), 6-2, 6-3.
Fifth seed Thiem needed two hours and 29 minutes to finally account for the 2013 and 2015 champion after letting slip three set points in the first.
Marin Cilic received a walkover after third-round opponent Milos Raonic was forced to withdraw with a knee injury, and the second seed will face Japan's Kei Nishikori in the last eight after his 6-0, 2-6, 6-3 victory over Andreas Seppi.
Grigor Dimitrov, seeded fourth, set up a quarter-final meeting with sixth seed David Goffin by beating Philipp Kohlschreiber 4-6, 6-3, 6-4 as the Belgian edged past Roberto Bautista Agut 6-4, 7-5.
Richard Gasquet reached a significant landmark when he defeated Mischa Zverev 6-2, 7-5 to record the 500th win of his career, the first Frenchman to do so.
Gasquet will now face Zverev's younger brother Alexander on his 21st birthday after the German defeated compatriot Jan-Lennard Struff 6-4, 4-6, 6-4.
The US Open, meanwhile, will become the first grand slam tournament to be broadcast solely on a digital platform in the United Kingdom and Ireland after it was announced Amazon Prime Video has signed a five-year agreement.
The deal with the United States Tennis Association begins this year and runs until 2022 and follows on from a similar contract signed between Amazon and the ATP.
The digital broadcaster has non-exclusive rights to this summer's Fever-Tree Championships at Queen's Club and the Nature Valley International at Eastbourne and will begin a five-year exclusive deal to show 37 ATP tournaments next year, taking over from Sky.
Alex Green, Prime Video Europe's managing director of channels and sports, said: "We are proud to partner with the USTA to add the US Open to the growing portfolio of sports available on Prime Video.
"This prestigious event, along with the other exciting tennis coming this year and next, makes Prime Video a destination for tennis fans in the UK and Ireland."
Sky held the UK broadcast rights for the tournament for 25 years until letting them go in 2016, with Eurosport showing the event for the last two years.
Tennis is Amazon Prime's first major foray into live sports broadcasting in the UK and Ireland, with their output also including a weekly NFL game, beach volleyball and a number of documentaries.
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