Caroline Wozniacki

Tennis star Caroline Wozniacki is the new face of Proactiv. Photo: Matthew Stockman/Getty Images

Tennis pro (and nail polish queen) Serena Williams has a rising new tennis star nipping at her heels.

Caroline Wozniacki
-- the 20-year-old Denmark native who unseated Williams last month as the world's number one ranked woman tennis player -- has just signed with skin care giant Proactiv, the very same brand Williams has fronted herself.

Word is, the striking 5'10" blonde will net several million dollars from the deal over a period of two years. Parent company Guthy-Renker confirmed the estimate, but declined to give further details on the exact contract amount.

Wozniacki says the glare of the spotlight has her thinking about her skin daily, and that finding a system that keeps her skin clear has come as a relief.

"When you are in the spotlight, there are thousands of pictures taken of you. I am really happy now that I have good skin, so there is one less thing to worry about," the tennis star told WWD.

The new Proactiv venture debuts today in Times Square with a commercial spot running twice an hour on MTV's 7th Avenue big screen. Other outlets will carry the spot starting in January which is when the Australian Open begins.

In a change of pace for the skin brand, the spot won't be in infomercial format, but instead feature Wozniacki in the kind of sexy and vibrantly colorful scenes that are more typical of beauty advertising.

The glitz and glamour of spokesmodeling isn't new to Wozniacki, who also lends her long locks to promote Danish haircare brand Allison, and her fit physique to the sporty Adidas by Stella McCartney line.

Yet, while her modeling career is taking off in big and exciting new ways, Wozniacki remains focused on the past time that brought her into the spotlight in the first place.

"I would love to keep this ranking," the player tells WWD of her number one position. "So my next goal is to try to win a grand slam."

We predict it'll be a showdown between two skincare sirens.

And if you're looking for your own skin pick-me-up, check out our before and after photos using the new Miracle Skin Transformer.