Serena Williams's preparations for the Australian Open have been hampered by surgery on her big toes.
Williams has subsequently pulled out of an exhibition match against world No 1 Victoria Azarenka in Thailand later this month. Williams spent almost a year off the tour with a foot injury, and then a blood clot on her lungs, after she stepped on broken glass on her way out of a restaurant in Munich in July 2010.
"I am being advised by my doctors to take more time to heal following a minor procedure I needed to address my ongoing foot issues," Williams said.
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