WINSTON-SALEM, N.C. — American Sam Querrey beat unseeded Ricardas Berankis of Lithuania 6-3, 6-4 on Thursday night in the quarterfinals of the Winston-Salem Open.

WINSTON-SALEM, N.C. — American Sam Querrey beat unseeded Ricardas Berankis of Lithuania 6-3, 6-4 on Thursday night in the quarterfinals of the Winston-Salem Open.

Querrey — at No. 29, the highest ranked player remaining in the field — advanced to a tournament semifinal for the third time this season, and his first since mid-February in San Jose, Calif

Querrey will face Austria's Jurgen Melzer, who beat Dmitry Tursunov of Russia 6-4, 6-3 in a match that was delayed twice for rain, the second delay lasting just over an hour.

In other quarterfinals at the Wake Forest Tennis Center, Alexandr Dolgopolov of the Ukraine overcame a knuckle injury on his left hand to beat Lu Yen-Hsun of Taiwan 7-6 (7), 6-3.

Dolgopolov will play France's Gael Monfils. Monfils topped Spain's Fernando Verdasco 6-7 (10), 6-4, 6-4.

New Haven Open

At New Haven, Conn., Caroline Wozniacki beat American Sloane Stephens 7-6 (6), 6-2 on Thursday, improving her record to 23-1 at the Connecticut Tennis Center, with her lone loss coming a year ago when she had to retire from the semifinals because of a knee injury.

The former No. 1 player in the world will play Simona Halep today. The Romanian beat Russia's Ekaterina Makarova 6-1, 7-6 (6).

The other semifinal will feature two players from the Czech Republic. Defending champion Petra Kvitova beat Anastasia Pavlyuchenkova 2-6, 6-2, 7-5. She will face Klara Zakopolova, who topped Elena Vesnina 4-6, 6-0, 6-4.