Nick Kyrgios Melts Down, Smashes Rackets After U.S. Open Loss: Watch

QUEENS, NY — As Russia's Karen Khachanov celebrated a five-set win that advanced him to the first U.S. Open semifinal of his career, his opponent opted to take out his frustration on a pair of unsuspecting tennis rackets.

Khachanov defeated Australia's Nick Kyrgios during a late-night quarterfinal match that started Tuesday night and concluded nearly 4 hours later at Arthur Ashe Stadium in Queens.

Khachanov edged out Kyrgios 7-5, 4-6, 7-5, 6-7 (3), and 6-4.

While Khachanov basked in his victory, Kyrgios walked the opposite way before smacking his racket against the ground four times. Tossing it on the fourth whack, he clearly wasn't finished as he grabbed another racket out of his bag and cracked that one against the court, too.

>>>See video of Kyrgios' reaction at the end.

Kyrgios' loss followed a victory over defending champion Daniil Medvedev at Flushing Meadows.

Khachanov, the 27th seed, now advances to the semifinals and will face No. 5 Casper Ruud on Friday for a shot at the Grand Slam championship.

Following the meltdown and match, Kyrgios gave credit to his opponent in an interview, according to the New York Post.

"I’m obviously devastated," Kyrgios said. "But all credit to Karen. He’s a fighter. He’s a warrior. I thought he served really good today. Honestly probably the best server I played this tournament, to be honest, the way he was hitting his spots under pressure."

When asked about Kyrgios' reaction, Khachanov said he saw "rackets were flying."

"I feel the pain for him," Khachanov added.

The Associated Press contributed to this report.