Kyrgios turned the match around after the interaction, dropping just six more games as he triumphed, 4-6, 7-6 (8-6), 6-3, 6-0, to set up a showdown with Roger Federer in the third round.
Amid a backdrop of boos from the crowd, umpire Mohamed Lahyani stepped down from his chair to talk to the 30th seed, being heard to say: "I want to help you. I'm not sure if that was encouragement", said the Australian who nevertheless won 19 of the last 25 games following Lahyani's unprecedented intervention.
Lahyani is under review by United States Tennis Association, who in a statement had said that Lahyani had only left his chair to check on Kyrgios' physical condition. Look, I wasn't feeling good. "This isn't you. I know that". "I really like him as a human. I want to help you", Lahyani said during the changeover.
His second-round win over France's Pierre-Hugues Herbert came after umpire Mohamed Layhani encouraged him to play better, apparently concerned that the world number 30 was not trying his best in the match. "I've seen your matches: you're great for tennis ..." It was not just about, 'How are you feeling?' 'Oh, I'm not feeling so well.' Go back up to the chair. Their first ever meeting at the Madrid Masters in 2015 had all three sets go into tie-breakers to give Kyrgios his only win.
Yawning one second, Kyrgios delivered a return victor the next to break Herbert to get back on serve at 4-5 in the second set before offering a subdued fist pump towards his box.
If Lahyani gets in trouble for his actions on Thursday, maybe he should consider moving from the umpire chair to Kyrgios' coach's box.
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Tournament referee Brian Earley added a freaky twist by claiming that Lahyani had only come down from his chair as the noise from the crowd made it impossible for him to communicate with the Australian.
Wozniacki lost, 6-4, 6-2, to 36th-ranked Lesia Tsurenko.
Zverev - perhaps benefiting from a tame early draw that started with two lucky losers - hasn't dropped more than four games in a set so far.
"It's not the umpire's role to go down from the chair. I don't think he's a coach, he's an umpire". It was a conversation and conversations change mindsets. Both could be on tap at the US Open, Federer needed a few swigs of water on another steamy day at the Open and he played like a former champion set to uncork a celebratory bottle of bubbly.
Herbert, however, was scathing of the US Open as he released a statement lambasting the umpiring decision that took place. "I don't think he's a coach, he's an umpire, and he should stay on his chair for that". "I can't think of one".
The Swiss superstar is the second seed behind Nadal at the US Open.
Kyrgios responded to her with a tweet, then deleted it and posted a second one.