American tennis player Jack Sock’s U.S. Open hopes came to a disappointing end on Thursday when he fainted on the court while leading 6-4, 6-4, 3-6, 1-2 over Belgium’s Ruben Bemelmans.

Jack Sock had to retire because he folded while he was leading 2 sets to 1 on Bemelmans #USOpen (via @BenRotenberg)
— We Are Tennis (@WeAreTennis) September 3, 2015

Prior to Sock’s physical collapse the player had paused to indicate his legs were cramping, but as help went to the court, Sock couldn’t manage to keep upright. Soon after, his opponent, who was ahead 2-1 in the fourth set, came over to shake his hand and it wasn’t just the player who was left disappointed. So were his fans.

Sock was later able to get up, but needed assistance to get into the locker room.

Sock, the tournament’s 28th seed, became the 13th player forced to retire from the tournament early and the first to leave a second-round match. Ten men and two women abandoned their matches in first-round play due to various injuries, as well as cramps. According to the New York Times, their “mass exit” set a record for the most ever on a single round.

Sock, no doubt, came to the tournament hoping for a different result. The 22-year-old had been having a great season, reaching the Round of 16 at the French Open earlier this year, which earned him his highest world ranking ever at No. 28.

Bemelmans, who will now move on to the third round, came into the tournament unseeded and ranked 107th in the world.