Controversy seems to trail Kyrgios, a prodigious talent who has spent his brief professional tennis career dazzling, frustrating and bewildering followers of the men's tour, sometimes in the course of the same match, in the uncanny, self-fulfilling way it attaches itself to provocateurs and iconoclasts in any line of work.
According to tennis reporter Ben Rothenberg, Lahyani could be heard saying things like "I want to help you", "You're great for tennis", and "I know this is not you".
Despite the win Federer was far from flawless, especially in the third set when he saw a 4-1 lead evaporate and fell 5-4 behind due to some uncharacteristically poor serving.
Both David Ferrer and Mikhail Youzhny played their final Grand Slam before retirement, while for Gilles Muller, Florian Mayer and now Julien Benneteau, New York was the end of the road.
However, 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.
Not only did Kyrgios turn around and win the second set following Lahyani's pep talk, he also won the next two sets (and in pretty dominant fashion) to advance to the third round.
Kyrgios has been forced to undergo work with sports psychologists in the past by the ATP in light of him openly tanking matches, and there had been occasions in this match before the pep talk when he was not even moving to return serves.
"I mean, like, I don't have a coach".
"I definitely know that I won't be the favourite, the crowd favourite here". But she's now lost in the second round at two consecutive majors, after doing the same at Wimbledon. Like, I was down 5-2.
But US Open officials leapt to his defence, backing up Layhani's story, which stated he only left his chair to address fears that Kyrgios may have needed medical attention. I think this was not his job.
"I can see that; I know this is not you". Chair umpires are never made available to the media, but tournament referee Brian Earley said Lahyani explained that he left his perch "to make sure he could communicate effectively" with Kyrgios in a noisy arena.
On Thursday, it was chair umpire Mohamed Lahyani who tried to implore Kyrgios to use his talents and start showing a little effort on the court. I'm not sure if that was encouragement. He was there for too long. "He just said that it's not a good look", Kyrgios said about his chat with Lahyani.
Normally, a chair umpire leans over from his or her post to speak to a seated player during a changeover. It's a conversation. Conversations can change your mindset.
"That's why it won't happen again and everybody knows that".
"I felt like it's maybe one of these years where it could be hot", Federer said Thursday.
'I wasn't feeling good. It was not just about how you're feeling, "Oh, I am not feeling well".