Nick Kyrgios crushed world No. 1 Daniil Medvedev's dreams of a U.S. Open title defense on Sunday with a 7-6 (11-9), 3-6, 6-3, 6-2 victory to reach the quarterfinals and ensure there will be a new top ranked player when the tournament ends.

In a meeting worthy of a Broadway show between two of the game's biggest servers and most combustible personalities, it was the Australian who was better in the match's biggest moments, showing off a renewed focus and fitness.

"It was an amazing match," Kyrgios said in an on-court interview before a soldout crowd at Arthur Ashe Stadium.