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.

The 29-year-old’s Australian Open return was short-lived — and he warned it could be his last singles match in his homeland.

Alex de Minaur, the world No. 8, and Nick Kyrgios, who is back after a two-year battle with knee and wrist injuries, are the headliners for their country at Melbourne Park. Kyrgios emceed the night session on John Cain Arena Monday, before De Minaur headlines Rod Laver Arena, the pantheon of Australian tennis Tuesday night.

If this was the last Australian Open singles match of Nick Kyrgios' career — and, to be sure, it's hard to know with him, no matter what came out at his news conference — the big-hitting, big-talking tennis player went out rather quietly Monday night.

After a disappointing return to the Australian Open, Nick Kyrgios appears to have retirement on the mind. The 29-year-old Australian tennis star said his return to the tournament — after taking more than two years to recover from an injury — on Monday, Jan. 13 may have been his last time playing a singles match in Australia.

Thanasi Kokkinakis says a doctor advised him not to play before he and Nick Kyrgios retired injured in the men doubles first round at the Australian Open.

Nick Kyrgios admits that he has "probably" played singles at the Australian Open for the last time after his return to the Grand Slam stage ended with defeat in the opening round in Melbourne.

If this was the last Australian Open singles match of Nick Kyrgios’ career — and, to be sure, it’s hard to know with him, no matter what came out at his news conference — the big-hitting, big-talking tennis player went out rather quietly Monday night.