American Jack Sock reaches fourth round of US Open for first time

  |   Tennis

Jack Sock, a 23-year-old American, is through to the second week of the US Open for the first time.

Sock, the No. 26 seed, surprised No. 7 Cilic 6-4, 6-3, 6-3.

Part of his run included winning the ATP Masters 1000 title in Cincinnati two weeks ago, beating Andy Murray in the final.

"Just all around, I think I'm putting things together, better and better,'' said the 26th-seeded Sock, who celebrated his victory with a racket-as-foil jousting move in tribute to his friend and fellow U.S. Olympian, bronze medalist fencer Miles Chamley-Watson.

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