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(February 9, 2010) It's Ana Ivanovic as you've never seen her before.

An expressive Ana unveils her face and figure to bring some summer shine to the coldest month of the winter.

The day after adidas announced it extended Ivanovic's endorsement pact for the rest of her playing career and beyond, the stunning Serbian appears in a photo layout in the annual Sports Illustrated swimsuit issue.

Brooklyn Decker, Andy Roddick's 22-year-old wife, graces the cover of the SI swimsuit issue that has been called "the super bowl of modeling."

Ivanovic puts pink tennis balls and a net to exquisite use in the photo spread. She wears a pink bikini and reclines on a bed of pink tennis balls in a series of photos and dons a red bathing suit wearing a tennis net draped over her hip in other shots.

The 2008 Roland Garros champion said she kept her impending appearance in SI a secret and is anxious to see the reaction of family, friends and fans.

"I'm very flattered and honored to be featured in such a magazine," Ivanovic said. "I didn't tell anyone yet so I think they're going to be surprised. I'm going to wait and see their reaction."

Ivanovic is the latest tennis star to pose in SI, joining Anna Kournikova, Maria Sharapova, Steffi Graf, Serena Williams, Maria Kirilenko, Tatiana Golovin and Tommy Haas (who posed with his girlfriend) as SI swimsuit models.

Photo Credit: Sports Illustrated