Defending champion Fernando Verdasco defeated Russia's Teymuraz Gabashvili 6-2 6-3 to reach the semi-finals of the US claycourt championships in Houston.
The sixth-seeded Verdasco, from Spain, will face eighth-seeded Sam Querrey in his next match after the American beat top-seeded Feliciano Lopez 6-4 6-1.
In the earlier quarter-finals, American Jack Sock beat fifth-seeded Santiago Giraldo of Colombia 6-4 6-4, and third-seeded Kevin Anderson of South Africa topped seventh seed Jeremy Chardy of France 7-5 6-7 (6) 7-6 (3).
The 22-year-old Sock is playing his third tournament of the year after having surgery to repair a torn muscle in his pelvis in December.
Play was delayed for more than five hours in the afternoon because of intermittent heavy rain and also an 18-minute stoppage caused by a power failure on the grounds.
"Some of the toughest conditions I've ever had to play in," Anderson said.
"The balls weren't in great shape. It was hard to even see them at the end of the second set. Once either one of us missed a first serve, it was pretty tough to win second-serve points because if one of us got a good (return), it was tough to engage."
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