Sock upsets Cilic at US Open

Kvitova, Azarenka and Bencic through in Stuttgart

Jack Sock knocked out former champion Marin Cilic in the third round of the US Open on Friday.

The American eased past the seventh seed 6-4, 6-3, 6-3, much to the delight of the home crowd in New York.

It was a match dominated by powerful serving and Sock took almost every slender opportunity that came his way.

The 26th seed converted his only break point of the opening set and consolidated to serve out the set and take a surprising lead.

Similarly in the second set, a break point would give Sock an 3-1 advantage. Cilic, who won the 2014 event in Flushing Meadows, then buckled under pressure 15/40 and 5-3 down as Sock again converted his opportunity.

The duo swapped service games in the third set until again Cilic found himself facing double break point. Sock won the second point and served out the match.

The win sees the Nebraskan enter the fourth round of a grand slam for just the second time. He will face ninth seed Jo Wilfried Tsonga next week.