Top seed Novak Djokovic continued his win streak against US players as he reached the quarterfinals of the Monte Carlo Masters with a 6-3, 6-0 victory over Taylor Fritz on Thursday.
The two-time champion has now won nine-in-a-row over US players since losing at Wimbledon 2016 to Sam Querrey.
The World No.1 will be playing his ninth quarterfinal here from 13 appearances at his home event; the win came a round after he claimed his 850th career victory against Philipp Kohlschreiber this week.
Djokovic turned in a steady performance with a dozen each of winners and unforced errors, while his opponent committed nearly 30 unforced errors in 68 minutes.
Second seed Rafael Nadal also made the last eight after dispatching Grigor Dinitrov 6-4, 6-1.
Sixth seed Stefanos Tsitsipas earlier lost 6-2, 1-6, 6-4 as Daniil Medvedev continued his run of form. The Russian winner will next line up against Djokovic after losing to the seed in January in the Australian Open fourth round.
Tsitsipas was caught on the back foot facing three match points as he trailed 0-40 on his serve late in the second set. After saving the first two, the Greek mismanaged the third to seal his exit after an hour and three-quarters.
Medvedev increased his leading total of ATP season match wins to 20 as a result of his success as he beat Tsitsipas for the fourth time without a defeat in the series.
The results:
Third round: Novak Djokovic bt Taylor Fritz 6-3, 6-0; Rafael Nadal bt Grigor Dinitrov 6-4, 6-1; Daniil Medvedev bt Stefanos Tsitsipas 6-2, 1-6, 6-4; Guido Pella bt Marco Cecchinato 6-4, 4-6, 6-4; Lorenzo Sonego bt Cameron Norrie 6-2, 7-5; Dusan Lajovic bt Dominic Thiem 6-3, 6-3.
Second round: Thiem bt Martin Klizan 6-1, 6-4; Lajovic bt David Goffin 6-3, 6-4; Dimitrov bt Jan-Lennard Struff 7-6(2), 6-4.