Nick Kyrgios was bothered by what he thought was the smell of marijuana during his US Open match on Wednesday.
The Wimbledon runner-up complained during his second round victory over Benjamin Bonzi about the scent, asking chair umpire Jaume Campistol to warn the crowd inside Louis Armstrong Stadium.
"You don't want to remind anyone not to do it or anything?" Kyrgios said during a changeover in the second set.
Armstrong features concession stands along the concourse level above the court and Campistol appeared to be telling Kyrgios the smell could be coming from their kitchens.
"Obviously, I'm not going to complain about food smells. Obviously, not," Kyrgios said.
Kyrgios said after his 7-6 (3), 6-4, 4-6, 6-4 victory that he is asthmatic.
"When I'm running side to side, I'm struggling to breathe," he said.
"Probably not something I want to be breathing in in between points."
The No. 23 seed from Australia was his usual animated self during the match, carrying on conversations with himself and people in the seats.
He received a warning for using profanity when the target of his anger was somebody in his box who Kyrgios didn't feel was being supportive enough.
The noise of New York is a challenge for many players, and Kyrgios struggled not only with the chatter of the fans but with the roars of the trains that can be heard from outside the open-air stadium.
"For someone that's struggled to focus in my career, I'm really trying hard to put my head down and play point by point, try to dig myself out of some certain situations. It's hard because there's a lot of distractions," Kyrgios said.
"Obviously, a lot of heckling going on as well. People are saying things. I got to be very careful with what I say these days."