Tsonga drops Sock to reach U.S. Open quarters

By Larry Fine NEW YORK (Reuters) - Jo-Wilfried Tsonga booked his third trip to the U.S. Open quarter-finals by dropping American Jack Sock in four sets in their fourth-round match at Flushing Meadows on Sunday. Ninth seed Tsonga, 31, breezed through the first two sets but 26th-seeded Sock forced a third-set tiebreak and fought off a match point before taking it 9-7. The Frenchman won on his third match point when Sock sent a forehand wildly beyond the sideline and celebrated with a jumping spin