Isner hits 30 aces but loses to Gojowczyk at Delray Beach

United States' John Isner returns the ball to Serbia's Dusan Lajovic during their Davis Cup World group first round tennis match in Nis, Serbia, Friday, Feb. 2, 2018. (AP Photo/Darko Vojinovic)

DELRAY BEACH, Fla. (AP) Top-ranked Jack Sock lost Wednesday night to fellow American Reilly Opelka 4-6, 7-5, 6-3 in the second round of the Delray Beach Open.

The 6-foot-11 Opelka, ranked No. 228, hit 17 aces. With two victories this week, he has doubled his win total for all of 2017.

No. 6-seeded John Isner hit 30 aces and swept all 18 of his service games but lost to Peter Gojowczyk Open, 7-6 (3), 6-7 (4), 7-6 (5). Isner won only nine points on Gojowczyk’s first serve and fell to 1-4 this year.

No. 9 Milos Raonic, the 2017 runner-up, lost to American Steve Johnson 6-2, 6-4. Johnson lost only 12 points on his serve.

American Donald Young, the runner-up in 2015, was eliminated by Evgeny Donskoy 7-6 (6), 6-3.