Sydney NSW, Australia, 5 January 2015 | AAP

Nick Kyrgios says his back injury is improving with treatment as he battles to be fit for the Australian Open.

The 19-year-old Australian star was forced to miss this week’s Hopman Cup in Perth with a back complaint.

But he has given fresh hope that he will be able to contest next week’s Apia¬†International Sydney which leads into the Australian Open in Melbourne, starting on 19 January.

“Just a little update on the back, it’s improving,” wrote world No.50 Kyrgios on Twitter.

“I’m having up to three physio sessions a day to be ready for Sydney and the AO. #ItsOn.”