World number one Ashleigh Barty announced her engagement to longtime partner Garry Kissick on social media on Tuesday.

"Future husband," the Australian wrote in a caption to a photo posted on Instagram that showed the smiling couple embracing with her engagement ring in full view.

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Barty, 25, will finish the year ranked world number one for the third consecutive time after winning five tournaments this season, including Wimbledon, to claim her second major title.

She last competed at the US Open in September before returning home to Australia, and can expect the strong support of fans in Melbourne Park at January's Australian Open.