Sock knocks Cilic out of Open in third-round upset

By Larry Fine NEW YORK (Reuters) - American Jack Sock knocked former champion Marin Cilic out of the U.S. Open on Friday in a power-packed 6-4 6-3 6-3 third-round victory at Flushing Meadows. "It was a big match for me, a big goal of mine." With the win, the 26th-seeded Sock matched his previous best grand slam advance, having reached the fourth round at last year's French Open.