Sam Querrey is the top-ranked American at No. 20, one spot ahead of John Isner.
Sam Querrey is the top-ranked American at No. 20, one spot ahead of John Isner.
Clive Brunskill/Getty Images

American Sam Querrey reached the quarterfinals of the Nice Open by beating Sergiy Stakhovsky of Ukraine 7-5, 6-3 on Wednesday.

The third-seeded Querrey broke his opponent three times, while Stakhovsky converted only one of seven opportunities.

Querrey will play French wild card Edouard Roger-Vasselin, who rallied to defeat Ricardas Berankis 2-6, 6-4, 6-2.

Albert Montanes advanced to the last eight by beating Victor Hanescu 7-5, 7-6 (2), and Pablo Andujar routed Lu Yen-hsun 6-2, 6-0.

Robin Haase was leading fourth-seeded John Isner 6-4, 1-4 when play was suspended because of rain.

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