The nationality of Sydney-born Briton Johanna Konta continues to cause fascination at the Australian Open, with even the Internet seeming to think she's Australian.

Konta, who spent her childhood Down Under before her family moved to Britain, has politely fended off a barrage of questions about whether she would consider switching allegiance.

On Saturday, after Konta reached the last 16, the on-court interviewer insisted she had traces of an Australian accent. Later a journalist told her that an Internet search showed an Australia flag next to her name.

‘It's not the first time that mistake has been made. It's all good. I'm definitely playing for Great Britain,’ she said.

The attention is a compliment to Konta, who eased past Denisa Allertova 6-2, 6-2 to become the first British woman to reach the fourth round in 29 years.

The 24-year-old, who stunned eighth seed Venus Williams in the first round, also equalled her best Grand Slam performance set at the US Open in September.

‘I have been amazed with how much support I've gotten, but I don't know if that's a British contingent here or if that's from my Australian roots,’ said Konta, whose sister still lives in Sydney.

‘I don't know. I'm just very grateful for all the people that do come out. Whether they are supporting me or the player I'm playing against, it's always good to have a lot of people around. It brings good energy.’

The world number 47, who equals Jo Durie's performance at the 1987 Australian Open, will now play Russian 21st seed Ekaterina Makarova for a place in the quarter-finals.

If she wins, there's no doubt her nationality will come up again.

‘I'm getting a lot of Australia questions. It is a compliment for you guys to be interested in my Australian roots, but unfortunately it's going to be a very boring answer to all these questions,’ she said.