Australian Nick Kyrgios is out of the US Open after he was forced to retire from his third round match against Illya Marchenko due toย a hip injury.

Kyrgios, who won the first set, began to feel hampered by the injury during the second set.

He had received treatment for the injury during his first two roundsย of the tournament.

The 21-year-old trailed two sets to one, 4-6, 6-4, 6-1, when he retired from the match.

It was Kyrgios' first loss in 21 matches to unseeded opponents at grand slam events.

Nick Kyrgios of Australia is examined during his third round Men's Singles match on Day Six of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Alex Goodlett/Getty Images)
Nick Kyrgios of Australia is examined during his third round Men's Singles match on Day Six of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)

โ€œIt's tough. I don't like to retire. It's probably like the second or third time I've done it,โ€ย Kyrgios said post match.

โ€œIt's never easy, of course. I've got a lot of belief in my game to still win matches when I'm not feeling great.

โ€œTo be fair, my hip was bothering me my first two matches and I got through. I guess it was just a matter of time.

โ€œMy physio has been helping me all week. I've been trying to fix it all week. But it's the whole year leading up to it with the whole schedule.

โ€œI got to take more time and be more diligent with the gym and everything so this doesn't happen to me.โ€