Nick Kyrgios’ return to the Australian Open is over after he and partner Thanasi Kokkinakis stopped playing while trailing in the second set of their first-round doubles match.

Thanasi Kokkinakis says he feels like he’s “letting people down”, with the doubles reunion of his 2022 Australian Open winning partner Nick Kyrgios “unlikely” after he suffered a recurrence of a pectoral injury in his second round loss at Melbourne Park.

Nick Kyrgios and Thanasi Kokkinakis's bid to repeat their Australian Open doubles triumph of 2022 ended in retirement in on Thursday when the latter was unable to continue their first-round tie.

Thanasi Kokkinakis succumbed to injury as he and Nick Kyrgios withdrew from their Australian Open doubles match against James Duckworth and Aleksandar Vukic.