Emma Raducanu left the court in tears after injury cut short her outing at the WTA 250 Auckland Classic on Thursday.
The Brit had to retire at 6-0 5-7 in her second-round match against Slovakian Viktoria Kuzmova after rolling her ankle.
The injury has cast doubt on her participation at this month’s Australian Open.
“I’ve put a lot of physical work in the last few months and I’ve been feeling good and optimistic,” Raducanu told Stuff Media.
“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 … we’ll assess over the next few days and see what the next steps are.”
Former US Open champion Raducanu swept the first set in 22 minutes.
She faltered in the second and had her left ankle examined during a medical timeout before leaving court in tears after being unable to complete the first point of the decider.
The Australian Open begins on January 16.