He will face Georgian Nikoloz Basilashvili in the semis after he knocked out Argentine qualifier Nicolas Kicker 6-3 6-1.
Top seeded Canadian Milos Raonic continued his impressive recent claycourt form as he moved into the last four by seeing off qualifier Gastao Elias 6-4 6-3.
Raonic, looking for his first title since January 2016, will face either third seed Tomas Berdych or fifth seed Gilles Simon in Friday's semi-finals.
(Reporting by Martyn Herman, editing by Pritha Sarkar)
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