The No. 4-ranked Ruud lifted his career record to 9-0 at Geneva, where he won back-to-back titles in the past two years. The clay-court event is a final warmup for the French Open and Ruud was runner-up there last year.

Ruud double-faulted on his first match-point chance against the 49th-ranked American before taking the second with a forehand winner as he advanced to the net.

“It’s a great win for me. J.J. is an aggressive, tough player,” said Ruud, who will face Nicolas Jarry in the quarterfinals on Thursday.

Jarry advanced when his opponent, sixth-seeded Tallon Griekspoor, withdrew ahead of their match.

Second-seeded Taylor Fritz struggled in the first set of his 4-6, 6-2, 6-3 win in an all-American match with No. 74-ranked Marcus Giron.

Fritz’s quarterfinals opponent is Ilya Ivashka, who beat eighth-seeded Adrian Mannarino 6-4, 4-6, 6-3.

Fourth-seeded Grigor Dimitrov, who got a wild card into the Geneva draw, eased past Roberto Carballes Baena 6-1, 6-4 to earn a quarterfinals match against 85th-ranked Christopher O’Connell of Australia.

O’Connell led 6-0, 3-0 against Bernabe Zapata Miralles when the seventh-seeded Spaniard retired from the match.

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