British number one Johanna Konta withdrew from the Sydney International for a second time in two days.
The 27-year-old was due to play Kiki Bertens as a lucky loser in the first round on Monday, having retired from her second-round qualifying match with a neck injury on Sunday.
No reason has been given yet for the latest withdrawal, which comes a week before the Australian Open.
Meanwhile, Heather Watson lost in the Hobart International first round.
British number two Watson was beaten 6-1 6-4 by Romania's Irina-Camelia Beguin.
The tournaments in Sydney and Hobart are the final WTA events before the Australian Open, the first Grand Slam of the year, begins on 14 January.