Kyrgios battled back from a set and break down to beat France's Pierre-Hugues Herbert 4-6 7-6 6-3 6-0 and reach a last 32 showdown with Roger Federer, but the defining moment came at the crucial juncture when he trailed 3-0 in the second set.
It was then that Lahyani, never one to be shy of the spotlight, got down from his chair to address Kyrgios, urging him to give his best and discussing if he needed the physio to come on 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. It's a conversation. Conversations can change your mindset.
"I want to help you".
"That's why it won't happen again and everybody knows that. I think everybody knows that".
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And, it appears as if Mourinho knows this team needs some better players, but who knows if that will even fix this. Manchester United haven't won the Premier League title since 2013 under Ferguson.
Like Federer, Herbert insisted that Lahyani had over-stepped the mark and said he would meet the official over the issue.
Lahyani appeared to offer words of encouragement to Kyrgios, who ended up winning the match 4-6, 7-6 (8-6), 6-3, 6-0.
Soon after Lahyani's intervention, Kyrgios began to play with more intensity.
"I think he finds it hard to not do any of those tricks", Federer said on ESPN after his own first round victory.
"He also informed Kyrgios that if his seeming lack of interest in the match continued, that as the chair umpire, he would need to take action". Serving bigger. I don't know.
"Layhani told Kyrgios that if he was feeling ill, that the tournament could provide medical help".
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Nick Kyrgios seeks some advice.
"If the team and everybody thinks that this is it now, and I feel it's truly that, I wouldn't probably tell it to that one journalist just it happened I was doing that interview that day", he said. Eventually, Okay, fine I get it, they're allowed to ask it.
The officiating at this year's US Open continues to make waves. "I know what I was doing out there wasn't good".
Angelique Kerber, the 2016 champion and No. 4 seed, and sixth-seeded Caroline Garcia both were pushed to third sets, with Kerber beating Johanna Larsson 6-2, 5-7, 6-4, and Garcia outlasting Monica Puig 6-2, 1-6, 6-4.
The German leads the ATP Tour in wins this year, has already won three ATP Masters 1000 titles and at 21 is the popular pick as the young star most likely to have a Grand Slam breakthrough and end the stranglehold veterans such as Federer, Rafael Nadal and Novak Djokovic have had on the majors. "I'm not happy with the way I lost that concentration and composure there".
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