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Nick Kyrgios retired with a left hip injury on the opening day of the Aegon Championships at Queen's, putting his Wimbledon prospects in doubt.

Kyrgios slipped while sidestepping along the baseline in game five of the first set of his match against Donald Young, landing awkwardly and aggravating an existing issue.

The Australian – seeded ninth – continued but he failed to convert two break points at 5-5 and after Young edged the tie-breaker 7-3, he called it a day ahead of the second set.

"I got the injections a couple weeks ago, and then I was in rehab for a couple of weeks and it settled down, and then on that fall I just felt sharp pain," Kyrgios said.

"So I felt pretty much everything I was feeling a month ago. It's not great at the moment. But we'll see."