World No. 1 Serena Williams has withdrawn from the Tokyo Toray Pan Pacific Open due to fatigue. The event, which has also lost Maria Sharapova to a shoulder injury, begins on Monday with Victoria Azarenka as the top seed.
According to her website, Serena is still scheduled to play in Beijing Premier event the week after Tokyo and then the WTA Championships in Istanbul.
Serena has nine titles this year with a 67-4 record. She has all but wrapped up the year-end No. 1 ranking.
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