Defending champion Andrey Rublev has been knocked out in the second round of the Monte Carlo Masters by Alexei Popyrin in straight sets.
Unseeded Australian Popyrin overcame sixth seed Rublev 6-4 6-4 and will play compatriot Alex de Minaur next.
"I am feeling really comfortable," Popyrin, 24, said. "[I am] happy to beat a guy who was in form, confident and the defending champ."
Elsewhere, second seed Jannik Sinner is through to the last 16.
The Australian Open champion beat American Sebastian Korda in straight sets - 6-1 6-2 - in his first match on clay this year.