Karen Khachanov knocks Nick Kyrgios out of the US Open.

Karen Khachanov has progressed to his first Grand Slam semifinal.

Khachanov dominated in the three hours and 39 minute fight.

7-5, 4-6, 7-5, 6-7, 6-4 were the scores

Kyrgios looked to have the momentum after taking the fourth-set tiebreaker, but he lost

After defeating the reigning champion Daniil Medvedev, Kyrgios struggled to maintain his momentum.

Two spectators were thrown out of the game early on after one cut the other's hair in the stands.

Kyrgios smashes a racket at the end of the match.

On Friday, Khachanov will compete against Casper Ruud for a spot in the championship game.