The 34-year-old says she's more buffed than ever, and would like a re-shoot.
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The two become the latest tennis players to pose for the yearly issue.
The two Americans each claimed their first career WTA titles last week.
The 32-year-old world No. 2 is a spokeswoman for the Pink Ribbon campaign.
The two had been working together since January, and played four tournaments as doubles partners.
An assortment of wild, woolly points from the first five and a half months of the 2014 tennis season.