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American Jack Sock has to be carried off court

NEW YORK – It's incredibly hot in New York, 93-degrees Fahrenheit with 38 percent humidity. With little shade guarding the courts, it feels more like 100 degrees. Players have been cramping all week, but Jack Sock became the worst victim on Thursday.

The 28th seed had to be carried off the court after retiring midway through the fourth set.

Sock, 22, won the first two sets, 6-4, 6-4. By the third set he started to cramp, allowing Belgium's Ruben Bemelmans to take one back. He received medical treatment between sets. Then, trailing 1-2 in the fourth, Sock had to call it quits. He froze after a serve, his leg completely locked up.

Sock sat down with the help of a trainer. He barely lifted his arm to shake Bemelman's hand when the Belgian walked over to Sock's end of the court.

The USTA later released a statement saying that Sock suffered from heat illness complicated by cramping.

"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 the 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."

No. 16 Sara Errani nearly became the day's first victim of the heat. Earlier Thursday, she battled dizziness and needed medical attention after the fifth game of the first set. She managed to overcome it, winning 0-6, 6-4, 6-3. In her press conference, she said the air conditioning at her New York hotel has been too powerful. As a result, she hasn’t been feeling well.

As Sock was helped off of the Grandstand court by the medical team, No. 5 Stan Wawrinka was battling with a teenager next door on Armstrong.

Hyeon Chung forced the 2015 French Open champion to tiebreaks in every set, but Wawrinka won all three. Wawrinka's serve made the difference, as he notched 26 aces to Chung's three. To continue moving on, Wawrinka will have to clean up his game. He had 66 unforced errors in the win.

In women's action, No. 2 Simona Halep defeated qualifier Kateryna Bondarenko, 6-3, 6-4 and No. 20 Victoria Azarenka, No. 22 Sam Stosur, No. 11 Angelique Kerber, and No. 18 Andrea Petkovic all advanced in straight sets.

In the major upset of the morning, No. 9 Garbine Muguruza – the young Spaniard who challenged Serena Williams in the Wimbledon final – fell to qualifier Johanna Konta, 7-6, 6-7, 6-2. The match lasted three hours and 23 minutes, making it the longest women's match since tiebreakers were introduced in 1970. Muguruza had advanced to at least the fourth round in this year's other majors.

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Danielle Elliot is a writer for Yahoo Sports. Find her on Twitter and Facebook.