Serena ends season early, opts out of WTA Finals

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Tennis World number one Serena Williams has decided to end her season early, choosing not to defend the WTA Finals title. Her last match was her shock loss to Italy's Roberta Vinci in the semi-finals of the U.S. Open last month. It ended her bid to become the first women in 27 years to win all four grand slam titles in the same season.

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