ATP Houston results

Following are the results on Friday at the ATP claycourt tournament in Houston, the United States (prefix number denotes seeding):

Quarter-finals

1-John Isner, United States, bt Chung Hyeon, South Korea, 7-6 (7-5), 6-4

4-Jack Sock, United States, bt 7-Marcos Baghdatis, Cyprus, 6-4, 6-4

3-Feliciano Lopez, Spain, bt Tim Smyczek, United States, 6-2, 6-3

Juan Monaco, Argentina, bt 5-Sam Querrey, United States, 6-4, 6-4

Endi