American Jack Sock eliminated 2014 U.S. Open champion Marin Cilic to reach the fourth round at Flushing Meadows for the first time.
The 26th-seeded Sock won 6-4, 6-3, 6-3 on Friday, taking all 14 of his service games and never facing so much as one break point. And he handled the Croatian’s big serve just fine, breaking the No. 7-seeded Cilic on four occasions.
The 23-year-old Sock’s only previous trip to the second week of a Grand Slam tournament came when he got to the fourth round of the 2015 French Open.
Sock is now 2-0 against Cilic, having come back from two sets down to win their Davis Cup match this year.