World number eight Caroline Wozniacki pulled out of her first match at the Sydney International with a wrist injury on Monday, a week before the start of the Australian Open.
The 24-year-old Dane, who lost in the final of the Auckland Classic last week, had already had her left wrist strapped when she was forced to retire from her first-round match against Barbora Zahlavova Strycova.
The fourth seed lost the first set 6-4 and had just saved break points to hold her first service game at the start of the second set, leaving Zahlavova Strycova to go through to a second round tie against Samantha Stosur.
Former US Open champion Stosur had earlier progressed at her home event with a rain-disrupted 7-6(3), 5-7, 6-3 victory over another Czech in Lucie Safarova.
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