World number one Novak Djokovic breezed into the Monte Carlo Masters quarter-finals, but Britain's Cameron Norrie could not progress from the last 16.
Serbia's Djokovic, 31, needed just one hour and eight minutes to win 6-3 6-0 against American Taylor Fritz.
Norrie lost 6-2 7-5 to Italian Lorenzo Sonego, ranked 40 places below him.
The British number two, who is set to rise into the top 50 next week, was broken four times and struggled to test Sonego's serve.
Norrie, 23, did break back when Sonego served for the match at 5-4, only to lose his serve in the next game as the Italian went on to seal victory with a hold to love.