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Defending champion Sock reaches Houston quarter-finals

AFP logoAFP 08-04-2016
KEY BISCAYNE, FL - MARCH 28: Jack Sock plays a match against Milos Raonic of Canada during Day 8 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Mike Ehrmann/Getty Images/AFPKEY BISCAYNE, FL - MARCH 28: Jack Sock plays a match against Milos Raonic of Canada during Day 8 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Mike Ehrmann/Getty Images/AFP © Provided by AFP KEY BISCAYNE, FL - MARCH 28: Jack Sock plays a match against Milos Raonic of Canada during Day 8 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Mike Ehrmann/Getty Images/AFPKEY BISCAYNE, FL - MARCH 28: Jack Sock plays a match against Milos Raonic of Canada during Day 8 of the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Mike Ehrmann/Getty Images/AFP

Defending champion and fourth seed Jack Sock held off Australian qualifier Matthew Barton 6-2, 7-6 (7/5) on Thursday to reach the quarter-finals of the ATP claycourt tournament in Houston, Texas.

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Sock's serve was rock solid, with the American winning 80 percent of his first serve points to wrap up the contest in 75 minutes.

"It's never easy playing a guy you've never faced before and who you haven't seen," Sock said. "He's very athletic and has a pretty big serve. He hit a couple (of serves) at 138 mph (222.09 kph). I didn't realise he had that massive of a serve." Sock, who had a first-round bye, was glad to finally open his account at a tournament where he won his first ATP title last year as an unseeded player.

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