It looks like the sun may have been the fiercest competitor to beat at the 2018 U.S. Open again. Grand Slam champion Novak Djokovic won Wednesday night’s quarter-final match against John Millman 6-3, 6-4, 6-4 at the U.S. Open in New York City, but not without another heat-related delay. Djokovic was tied 2-2 with Millman when Millman had to tell the chair umpire he was just way too sweaty to continue without a break. The temperature clocked in at 92 degrees. During the second set, Australia’s Millman assessed the perspiration dripping off of his body and realized he was drenching the court in the process, making it too slick to play without fear of slipping. And so he “approached the chair umpire to note his excessive sweating and the moisture it was leaving on the court,” according to the USTA. Thanks to the United States Tennis Association’s Equipment Out of Adjustment regulation, the sweat-related court conditions were treacherous enough that Millman was cleared to leave to change out of his sweat-soaked getup without consequences. US Open statement on that 2-2 mess between Millman and Djokovic: pic.twitter.com/E2Anpdopyg — Carole Bouchard (@carole_bouchard) September 6, 2018 The game resumed after roughly 6 minutes, but Millman’s break didn’t remedy the situation. “You don’t stop sweating, though.