Kyrgios dispatched world No.88 Steve Johnson 6-3, 7-6, 6-4 in the first round, a performance overshadowed by his controversial post-match comments.
But that - plus the usual moaning to his box for not offering enough encouragement and for his shorts apparently being too small and briefly complaining of boredom - were nothing compared to branding the umpire a "f. tool, a potato" and obliterating two racquets two weeks ago in Cincinnati.
"If you look at the way he plays, and you look at NY as a place, they like loud, they like boisterous, they like flamboyance", Groth said.
Believed to be the biggest fine in the sport's history, Kyrgios was slapped with separate penalties for an audible obscenity, ball abuse, verbal abuse towards the umpire, leaving the court and four counts of unsportsmanlike conduct during his explosive second-round loss to Karen Khachanov.
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A statement read: "I would like to go on record to clarify my comment around the ATP being corrupt, it was not the correct choice of words and my point and intention was to address what I see as double standards rather than corruption".
When told by the journalist that they do swear but not usually in public, he responded: "You are also not an elite athlete". "I just need to take the positives out of it, because once I lose that first set I do get better".
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Kyrgios will face Frenchman Antoine Hoang is the second round on Thursday.
"If he got that set the match could have been different and we'd still be playing right now".
Groth says he liked what he saw from Kyrgios in round one.
"I think it makes a difference, so when someone like Nadal sometimes goes over the time limit, I think they give him the benefit of the doubt because he tries so hard and he plays so hard every single point", he said.
"It's just so good to see someone I grew up with, who's been dealt unbelievably unlucky injuries - he's had to deal with so many rough patches in his career - to see him back".
The 24-year-old hasn't made the last eight of a major since the second of two as a teenager nearly five years ago. "I'm not fussed about it at all", he said.
Thompson was superb in clubbing Joao Sousa 6-3 6-2 6-4, Popyrin beat Federico Delbonis 6-1 7-5 7-6 (7-5), Kokkinakis's 6-3 7-6 (10-8) 6-7 (4-7) 6-2 victory over Ilya Ivashka was his first at a slam since 2015 and Tomljanovic pulled off a remarkable 1-6 7-5 6-1 comeback win over Marie Bouzkova from a set and 5-2 down against the Czech.
Roger Federer has refused to get embroiled in the newest controversy surrounding Nick Kyrgios.