I wasn't really listening to him, but I knew it wasn't a good look. I just saw that Nick from that point started to play really focused, 100%.
Lahyani raised eyebrows for what appeared to sound more like an encouraging pep talk than a formal directive from an impartial official. The only thing he can tell him is, 'Yeah, pay attention, because if you continue like this, I'm going to give you a warning, ' something like that.
"Go back up to the chair".
"He was down there for too long". He was heard telling the Australian, "I want to help you", among other seemingly sympathetic pleas.
"I'm here to do something I've never done in 40 years in tennis, I'm going to defend this umpire", McEnroe said on ESPN.
"It's not the umpire's role to go down from the chair", he said after his match. He doesn't need to say the words he said on video.
"It was a conversation, and coversations can change mentality".
Former players, pundits and fans couldn't believe what they were witnessing and called out Layhani's conduct, suggesting the official's behaviour amounted to "on-court coaching" and that he should have been pulled from the match and the tournament altogether.
Federer was among a number of fellow players who felt the umpire's actions were inappropriate.
Asked how he would respond if the umpire in the next match does the same thing as Lahyani, Federer said: "That won't happen".
"First of all, I'm upset against me because I should have finished the second set".
"That's why it won't happen again and everybody knows that".
Australian Open champion Wozniacki went down 6-4, 6-2 to world number 36 Tsurenko who claimed a second top 10 win this month having also defeated Garbine Muguruza in Cincinnati.
The 37-year-old Swiss eased to a 7-5 6-4 6-4 victory in New York City in one hour 56 minutes.
The Australian did receive treatment from his physio at the next break in play, at 4-1 down in the second set.
A win for the 20-times grand slam champion would confirm a weekend showstopper with Kyrgios, nearly certainly under lights at Arthur Ashe Stadium, world tennis's biggest stage at the venue for the US Open at Flushing Meadows in NY.