Victims Continue To Drop Due to Heat At U.S. Tennis Open

Jack Sock, a 22-year-old American, is the latest victim of the heat wave that has gripped the 2015 US Open.

In a dramatic moment that shook the overflow Grandstand crowd, Sock collapsed on the court Thursday afternoon early in the fourth set of his second-round match with Ruben Bemelmans. Sock was carried out of the stadium by trainers and security as fans gave him a standing ovation.

"Playing in the US Open is the biggest and most important moment of the season for me, so having to retire from my match today is extremely disappointing," Sock said in a statement. "I want to thank everyone for their support and can't wait to be back next year. I feel better already and look forward to playing Davis Cup."

Less than two hours after his match ended, Sock was spotted in the players' facility. Red-faced and sipping a cup of ice water, Sock limped around in small circles in the atrium leading to the players' garden.

The tournament saw a first-round Grand Slam record of 10 retirements, most of them heat-related. Ice towels have been a popular item with players as they sit in their changeover chairs.

The 12 retirements by men's players at this US Open are also an Open-era record for any Grand Slam.