Andrea Petkovic has a lower back stress fracture, which forced her to have an injury timeout during her 7-5 6-4 loss to Agnieszka Radwanska in the second round of the Apia International Sydney, and will not play the upcoming Australian Open.
The tenth-ranked Petkovic would have been seeded No.10 at the Grand Slam. Last year the top German played the quarterfinals of three Grand Slams, including the Australian Open.
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