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.
Two-time tournament champion Djokovic has now won nine in a row over US players since losing at Wimbledon 2016 to Sam Querrey.
The world number one will be playing his ninth quarter-final 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.
Fritz came to the court after defeating Jo-Wilfried Tsonga and Diego Schwartzman.
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.
Defending champion Rafael Nadal was to play his second match of the pre-Roland Garros campaign when he faced Grigot Dimitrov in a third-round encounter.
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.