Nick Kyrgios, Victoria Azarenka 'exchange flirty tweets'

Tennis stars Nick Kyrgios and Victoria Azarenka appeared to be in a flirtatious mood when they exchanged tweets during the Australian Open.

After home favourite Kyrgios came from behind to seal a five-set victory over Andreas Seppi, the 19-year-old found some time to pop on to social media.

The teenager asked his fans to use the hashtag #NKAO15 to ask him questions on Twitter, and Azarenka, who was knocked out by Dominika Cibulkova today, decided to get involved.

She asked, "How can I learn to serve as big as u @NickKyrgios ??? #NKAO2015," to which he replied, "Private lessons of course!!"

"@NickKyrgios: "How can I learn to serve as big as u @NickKyrgios ??? #NKAO2015" Private lessons of course!! 🙈" okay I'll book one 🙊😂

— victoria azarenka (@vika7) January 24, 2015