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New York - Jo-Wilfried Tsonga reached the quarter-finals of the US Open for the second successive year on Sunday with a 6-3, 6-3, 6-7 (7/9), 6-2 victory over American Jack Sock.
The ninth seed from France fired 54 winners to oust 26th-seeded Sock, the lone remaining US man in the field.
In match pitting two players with fearsome forehands, Tsonga boasted the deadlier precision, although Sock didn't go quietly, saving a match point in the third-set tiebreaker to force the deciding fourth set.
Once he had, however, 2008 Australian Open runner-up Tsonga reasserted himself, powering to a 5-2, 40-0 lead.
The Frenchman had a little hiccup with a double fault before belting an unreturnable serve to close it out.
"It was really difficult because he played great in the third, but I have no regrets about this set because he played well," Tsonga said. "I just tried to play my game in the fourth."
He will face either world number one and defending champion Novak Djokovic or US Open debutant Kyle Edmund of Britain for a semi-final berth.
The 23-year-old Sock, who didn't face a break point as he stunned 2014 champion Marin Cilic in the third round, remains in search of a first Grand Slam quarter-final appearance.
