The fifth-seeded Hurkacz saved three of the four break points he faced against Humbert. He will next play Felix Auger-Aliassime in the quarterfinals. The Canadian player defeated Mackenzie McDonald 7-6 (7), 6-1 in their second-round match.
Top-ranked Daniil Medvedev advanced by beating David Goffin 6-3, 6-2. The Russian will next play Ilya Ivashka of Belarus in the second round.
Medvedev, who reclaimed the top spot in the ATP rankings on Monday, is bidding for his first title of the year.
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