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Surround sound came to Montreal and Karen Khachanov felt the sting of the noise.
Khachanov played party pooper spoiling Canadian phenom Felix Auger-Aliassime's 19th birthday before his hometown fans with an intense, 6-7 (7), 7-5, 6-3 triumph to set up a Coupe Rogers quarterfinal vs. third-seeded Alexander Zverev.
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Afterward, Khachanov called out Montreal fans for "unrespectful" and "disappointing" behavior. Many fans were positive in their support of Auger-Aliassime chanting "Let's Go Felix!"
However some fans were cheering Khachanov's errors and whistling at the Russian creating a Davis Cup atmosphere.
"I cannot deny that I got a little bit crazy with the crowd," Khachanov said. "But I'm really a bit disappointed, I could say, with the crowd as well. I don't have anything against when they cheer for Felix. It's normal. He's home favorite, especially from Montreal. I wish they could cheer the same way in Russia for me.
"But still, you know, not when I miss or not wishing me to miss, screaming during the points, Out. I think it's unrespectful. I just got crazy. On the other side, I provoke the crowd, and that gave me also some kind of energy, as well. I don't know, I was doing some bullshit, honestly."
Khachanov said passionate fans can fuel players' energy, but said the whistling is disrespectful and reminded fans tennis "is not soccer."
"I don't have anything against the crowd supporting after good rallies or good points of course," Khachanov said. "But sometimes when they start whistle, it's kind of reminding me soccer. Again, we are in tennis, we are not in soccer. You have to respect the game.
"But some people didn't know how to cheer. They didn't know. They see it's his birthday today, they wish him to win. I understand. Sometimes when you're fighting against opponent, against the crowd, it becomes really difficult to manage to win the match."
Immediately afterward, Khachanov apologized to both fans and Auger-Aliassime. The Canadian teenager said his sixth-seeded opponent has no reason to apologize.
"I think when he got frustrated, I think it was because of the crowd," Auger-Aliassime said. "People were obviously getting loud, sometimes not the best moments for him, when he would do mistakes, or I had a lucky shot. I think he just said when he got mad, it was nothing against me.
"Sometimes he was just frustrated at the crowd. That's it. Me and Karen get along well. There's no hard feelings. He's a nice guy. It was nice of him to apologize, but I don't think he needed to. Everything was fair and with great sportsmanship, yeah."
Khachanov praised Auger-Aliassime as a future Top 10 player.
"His breakthrough is pretty fast, as you can see maybe Rafa was doing," Khachanov said. "It's pretty impressive. Let's see how he keeps developing his game. But I'm pretty sure if something doesn't go wrong, he would be sooner or later in top 10."