Jack Sock of the U.S. returns in the fourth round match of the French Open tennis tournament against Spain's Rafael Nadal at the Roland Garros stadium, in Paris, France, Monday, June 1, 2015. (AP Photo/Thibault Camus)
Thibault Camus
July 15, 2015

NEWPORT, R.I. (AP) Americans Jack Sock and Rajeev Ram advanced to the quarterfinals of the Hall of Fame Tennis Championships on Wednesday.

Fourth-seeded Sock rallied past Lukas Lacko of Slovakia 3-6, 7-6 (4), 6-4. Ram defeated Yuichi Sugita of Japan 6-4, 6-3, a day after upsetting top-seeded John Isner.

The 31-year-old Ram returned the various slices, lobs and other change-of-pace shots offered by Sugita. The 161st-ranked Ram last won the Newport title in 2009.

The 22-year-old Sock, ranked 39th, needed two hours to advance in humid conditions on center court.

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