Tenth-seeded Victoria Azarenka collapsed early in her match and had to be taken off the court in a wheelchair to get medical attention. The Associated Press reports she hadn't been moving well during her match and was down 5-1 when the heat got the best of her. There is no update on her condition at this time.

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It's been absurdly hot this summer. Yesterday, the U.S. Open implimented the heat rule, which means that any woman whose match goes into a grueling third set gets a 10-minute break before the start of the set. No word yet on whether the heat rule will be in effect today. There is no heat rule for the men, who play the best of five sets. As of right now, it is 93 blazing degrees here in Flushing, soaring up to a high of 97 with a heat index that is likely to go into the triple digits.

This heat is no joke. So spectators, wear sunblock, light-weight, light-colored clothing and drink tons and tons of water. Nausea, fatigue, weakness and headaches are symptoms of heat stroke. Vendors are giving out ice water for free, so if you don't want to pay $4 a bottle, you can get yourself a nice cup of delicious NYC tapwater.