NEW YORK — Nick Kyrgios was losing big at the U.S. Open on Thursday, and barely even trying. He didn’t move while so-so serves flew by for aces. He casually put groundstrokes into the net, and double-faulted without caring.

The crowd began booing. The chair umpire, Mohamed Lahyani, decided to intervene. In an unusual sight for Grand Slam tennis, Lahyani clambered down out of his seat during a break between games, leaned over with hands on knees, and spoke with the 30th-seeded Kyrgios, saying, among other things, “I want to help you.”

It all seemed like an impromptu intervention for the mercurial Kyrgios, right out there on Court 17 at Flushing Meadows, and it raised questions about whether Lahyani overstepped his duties.

Kyrgios went from trailing by a set and a break at the time to wresting control of the match by coming back to beat Pierre-Hugues Herbert 4-6, 7-6 (6), 6-3, 6-0.

“This was not his job,” Herbert said about Lahyani, whom he thinks should be sanctioned in some way. “I don’t think he’s a coach, he’s an umpire, and he should stay on his chair for that.”

The U.S. Open’s referee and chief umpire were reviewing what happened, as was the Grand Slam Board. Chair umpires are never made available to the media, but tournament referee Brian Earley said Lahyani explained that he left his perch “to make sure he could communicate effectively” with Kyrgios.

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According to Earley, the official said he wanted to check whether Kyrgios needed medical attention and to warn the player that Lahyani “would need to take action” if the “seeming lack of interest in the match continued.”

During an occasionally confrontational and sarcastic exchange with reporters, Kyrgios laughed at the suggestion that he had received coaching or a pep talk from Lahyani.

“I mean, like, I don’t have a coach. I haven’t had a coach for, like, years. Of course he wasn’t coaching me. Like, what are you talking about?” Kyrgios said.

“He said he liked me. I’m not sure if that was encouragement. He just said that it’s not a good look,” Kyrgios said about his chat with Lahyani. “Look. I wasn’t feeling good. I know what I was doing out there wasn’t good. I wasn’t really listening to him, but I knew it wasn’t a good look.”

Kyrgios, a 23-year-old Australian, has run into trouble in the past for not giving his all during matches, even drawing a fine and suspension from the ATP men’s tour in 2016.

As Herbert put it: “Just sometimes he’s mentally not here.”

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After reaching the third round by defeating Benoit Paire 7-5, 6-4, 6-4, Federer criticized Lahyani for going to talk to Kyrgios for as long as he did, and from as close as he did.

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 he said. I don’t care what he said. It was not just about, ‘How are you feeling?’ ‘Oh, I’m not feeling so well.’ Go back up to the chair. He was there for too long. It’s a conversation. Conversations can change your mindset. It can be a physio, a doctor, an umpire, for that matter,” Federer said. “That’s why it won’t happen again. I think everybody knows that.”

Three seeded men departed earlier: No. 12 Pablo Carreno-Busta, a semifinalist in 2017, stopped in the fifth set because of a leg injury; and No. 14 Fabio Fognini and No. 23 Hyeon Chung also lost.

The 11th-seeded woman, Daria Kasatkina, was eliminated by Aliaksandra Sasnovich, but 2016 champion Angelique Kerber, 2017 runner-up Madison Keys and two-time Wimbledon champ Petra Kvitova all won.

In an evening match, Novak Djokovic wasted a match point in the third set, before going on to a 6-1, 6-3, 6-7 (2), 6-2 win against Tennys Sandgren to reach the third round.


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