Former champion Marin Cilic crashed out of the US Open on Friday, falling 6-4, 6-3, 6-3 to 26th-seeded American Jack Sock.

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Croatia`s Cilic, the seventh seed, is just two years removed from his 2014 triumph over Kei Nishikori in the final at Flushing Meadows.

Sock will seek a quarter-final berth against France`s Jo-Wilfried Tsonga, a 6-3, 6-4, 7-6 (7/4) winner over South African Kevin Anderson.