Nick Kyrgios stunned defending champion Daniil Medvedev 7-6(11), 3-6, 6-3, 6-2 at the US Open on Sunday evening with a brilliant performance to reach the quarter-finals at Flushing Meadows.

The 23rd seed entered the match with a 3-1 ATP Head2Head lead against Medvedev and in the best form of his career, but taking out the top seed at a Grand Slam was an entirely new challenge. The Australian passed the test with flying colours, playing his aggressive game to triumph after two hours and 53 minutes.

“What a place to do it,” Kyrgios said. “Packed house in New York!”

Medvedev will lose his top spot in the Pepperstone ATP Rankings on the Monday after the US Open. Rafael Nadal, Carlos Alcaraz or Casper Ruud will become World No. 1. Kyrgios advances to his first quarter-final in New York, where he will next play Karen Khachanov.

“I want to go all the way,” said Kyrgios, whose victory was his third against a World No. 1. “Hopefully it is possible.”

source atptour.com