Emma Raducanu has withdrawn from this week's WTA event in Auckland because of a back problem.
The 22-year-old was due to play Robin Montgomery of the United States in the first round of the ASB Classic on Tuesday.
Raducanu will now fly to Melbourne to continue her preparations for the Australian Open, which begins on 12 January.
"Tried my best to be ready," she said. "I love Auckland and the fans here, but unfortunately I picked up a back niggle and won't be ready in time.
The 2021 US Open champion sprained ligaments in her foot in Seoul in September and could only play three further matches last season.