Emma Raducanu has criticized the indoor courts at the ASB Classic in New Zealand after suffering an ankle injury which has put a question mark on her participation at the Australian Open.

The former US Open champ was left in tears as she was forced to withdraw from Thursday's second-round match against Viktoria Kuzmova at the start of the third set, having rolled her ankle.

The contest had been moved indoors due to rain in Auckland, but the 20-year-old Raducanu was not happy with the standard of the playing surface.

"It's difficult to take," Raducanu said.

"I've put in a lot of physical work in the last few months and I've been feeling good and optimistic. So to be stopped by a freak injury, rolling an ankle is pretty disappointing, in the first week as well. I thought I was playing some pretty decent tennis.

"The courts are incredibly slick, like very slippery, so to be honest it's not a surprise that this happened to someone.

"It's out of my control and after a very long day of waiting around. But we'll assess over the next few days and see what the next steps are."

Raducanu had breezed through the opening set 6-0, but Kuzmova hit back to take the second 7-5.

Raducanu called for medical treatment before the start of the third set, and it quickly became apparent she could not continue.