Jack Sock to play John Isner in a U.S. Men's Clay Court semifinal

Top-seeded John Isner of the United States beat South Korea's Chung Hyeon, 7-6 (5), 6-4, on Friday night in the U.S. Men's Clay Court Championship quarterfinals in Houston.

Isner will face the fourth-seeded defending champion Jack Sock of the United States, a 6-4, 6-4 winner over seventh-seeded Marcos Baghdatis of Cyprus.

In afternoon matches at River Oaks, Argentina's Juan Monaco beat fifth-seeded Sam Querrey, 6-4, 6-4, and third-seeded Feliciano Lopez of Spain topped American Tim Smyczek, 6-2, 6-3. The 32-year-old Monaco won the event in 2012.

In doubles, American twins Bob and Mike Bryan advanced to the final, beating Querrey and Steve Johnson 7-6 (5), 6-3. The Bryans have won the event five times and have 109 team titles.

Kerber advances in Charleston

Australian Open champion Angelique Kerber moved a step closer to her second straight Volvo Car Open title, reaching the semifinals in Charleston, S.C., with a 6-2, 6-3 victory over Irina Camelia Begu.

Kerber, the top seed, will face No. 7 Sloane Stephens, who defeated 14th-seeded Kasatkina, 6-1, 5-7, 7-5.

The other semifinal Saturday features fifth-seeded Sara Errani of Italy against Russian qualifier Elena Vesnina.

Errani defeated Yulia Putintseva of Kazakhstan, 7-6 (2), 6-1, while Vesnina topped Laura Siegemund of Germany, 7-5, 6-4.

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