Thursday's freakish scenes prompted an outcry on social media, with the umpire criticised for his role in how events panned out.
At which point Lahyani came down from his chair, an unusual move, apparently to urge Kyrgios to show more effort, and could be heard telling him: "I want to help you".
When Lahyani climbed down from his chair to chat with Kyrgios, there were rows of empty seats and no wait time.
"I think we both really played on a really high level from the first point", said 2016 champion Kerber who had led by a set and 5-2 at one stage. It's not the umpire's role to go down from the chair. That is what this was on Court 17, even as the Open attempted to spin things its way by claiming in a statement that Lahyani - who was not made available to the press - had acted out of concern for Kyrgios' health.
Through all of it, there's no suggestion that Kyrgios did anything wrong; he didn't ask for any of it to happen, after all. Of course he wasn't coaching me.
"This was always the Grand Slam where I didn't play my best ever", Zverev said.
'I'm not sure it was encouragement.
Nick Kyrgios seeks some advice. "I know what I was doing out there wasn't good".
"You never know what woudl have happened if [Lahyani] didn't go down [from] the chair and start talking to him", he said. He just said that it's not a good look.
Regardless, it's another incredibly weird chapter in the intriguing and at times baffling career of Nick Kyrgios; a man who is very good at tennis, but has little desire or love for it.
Image Kyrgios beat Pierre Hugues Herbert of France in four sets
Kyrgios put a heckler in his place after a jibe about Bouchard.
Kyrgios could meet Roger Federer in the third round.
Normally, a chair umpire leans over from his or her post to speak to a seated player during a changeover.
I don't know what to think. I don't care what he said.
"I want to help you".
"He was down there for too long".
"It was a conversation, and coversations can change mentality". "It can be a physio [logist], a doctor, an umpire, for that matter". "I can't think of one".
It was, to be sure, the most conversation-worthy topic on Day 4 at Flushing Meadows, where the most notable result was No. 2 seed Caroline Wozniacki's 6-4, 6-2 loss to Lesia Tsurenko of Ukraine at night.
Kyrgios went on to win the second set - and the next two to wrap up the match 4-6, 7-6 (6), 6-3, 6-0 and secure a third-round berth.
Seeking some sort of physical treatment, Kyrgios said: "Okay, "Just call the trainer to the court and I'll try".
"I'm not happy with the way I lost concentration and composure but I managed to kind of regroup in the fourth".
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