Casey Dellacqua out of Australian Open due to post-concussion syndrome

SYDNEY -- Doubles specialist Casey Dellacqua has been forced to withdraw from the Australian Open due to the lingering effects of a concussion she sustained at the China Open in October.

The 30-year-old Australian, who reached two doubles Grand Slam finals this year, fell heavily during the Beijing tournament and was hospitalized.

Her manager, Sam Maxwell, said Friday that Dellacqua has been diagnosed with post-concussion syndrome, putting her playing future in doubt.

Maxwell says Dellacqua is still having headaches and neck pain, and is "still not in a position where she is able to train to the level required to be able to play professional tennis."

She also will miss the Hopman Cup mixed-teams event in Perth -- where she was scheduled to partner Lleyton Hewitt -- and the Sydney International.