Van de Zandschulp won two tiebreakers and had 15 aces, beating 10th-seeded Benjamin Bonzi of France 7-6 (6), 7-6 (1). Van de Zandschulp will move into the top 20 in the world rankings for the first time if he can win the tournament.
Serbia’s Laslo Djere also advanced to the semifinals, beating Richard Gasquet of France 6-4, 3-6, 7-6 (6).
Djere will face another unseeded player in Switzerland’s Marc-Andrea Huesler, who knocked off No. 13 seed Jack Draper of Britain 6-4, 6-4 in the final match of the night.
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