The match created a huge storm after respected umpire Mohamed Lahyani lost patience with the under-performing 30th seed and climbed down from his chair to tell the Australian, trailing by a set and 3-0, to try harder.
"I want to help you", said Lahyani, as he exhorted Kyrgios to give more effort and live up to the fans' expectations.
After Alize Cornet's shirt-changing controversy, and Fernando Verdasco's coaching row, Nick Kyrgios received a freakish pep-talk yesterday from the chair umpire on his court.
It is not the first time that Lahyani has intervened with players appearing to "tank" matches and look out of sorts, but this went further than before and looked nearly like on-court coaching. "Conversations can change your mindset".
'It didn't help me at all.
"That's why it won't happen again". I wasn't really listening to him, but I knew it wasn't a good look.
He will expect his good fortune to continue when he meets unseeded countryman Philipp Kohlschreiber in the third round on Saturday, having won their last two meetings.
Kyrgios, who had been repeatedly double faulting up to that point, sometimes delivering second serves at 130mph or more, played it down afterwards, saying: 'He was just concerned about how I was playing, like, "Nick are you okay?"'
Plenty of others in the tennis world raised their eyebrows or flatly criticised Lahyani for his actions, including Rothenberg, who called it "insane" and called for Lahyani to be pulled from the match.
"I don't like warm drinks, let's put it that way", Federer said, laughing.
From 0-3 down, Kyrgios broke his opponent back late on in the second set and drew level by clinching it in a tiebreak.
"I felt like it's maybe one of these years where it could be hot", Federer said Thursday. "But his behaviour and motivation on court changed after this moment and then he dominated the match", Herbert said.
"Layhani told Kyrgios that if he was feeling ill, that the tournament could provide medical help. At the next changeover, Kyrgios, down 1-4, received treatment from the physio".
"I'm here to do something I've never done in 40 years in tennis, I'm going to defend this umpire", McEnroe said on ESPN. "Oh, I'm not feeling so well".
Djokovic, the sixth seed, struggled badly during his first round clash with Hungarian Marton Fucsovics, dropping a set before rallying to win in four after spending time in an ice bath during the mandatory 10-minute heat break. I umpired thousands of matches. "It can't be true", Federer said after beating Benoit Paire 7-5, 6-4, 6-4 to reach the third round of the US Open.
Wozniacki, who won the Australian Open in January and is a two-time finalist in NY, is the third top-10 woman already out of the draw, including No. 1 Simona Halep.
"I get what he was trying to do".