Nick Kyrgios has once again made of a mockery of the rankings and blown the US Open wide open with a rollicking fourth-round win over world No.1 and defending champion Daniil Medvedev.
In an explosive encounter laced with controversy and drama, Kyrgios risked being defaulted and overcame a running verbal battle with the chair umpire before ousting the top seed 7-6 (13-11), 3-6, 6-3, 6-2.