Jack Sock’s 2015 U.S. Open came to a premature end after a scary moment.
The No. 28 seed won the first two sets in his second round match against Ruben Bemelmans on Thursday, but he had to retire early after collapsing on the Grandstand.
As you can see in the video, Sock noticeably was cramping before he collapsed. It has been a hot U.S. Open with the temperature reaching 90 degrees Thursday. Sock is now the 13th player to retire from the U.S. Open mid-way through the second-round matches.
Trainers used ice bags to try and cool down Sock, who eventually was was helped off the court.
Thumbnail photo via Twitter/@SkySportsTennis