Tennis ace Maria Sharapova has unveiled the 2007 US Open day and evening dresses she will wear for match play, on the rooftop of Rockefeller Center, New York.

The defending champion joined Nike designers for a press conference to debut the custom, atomic red, Swarovski-crystal encrusted evening dress she'll take to the court for her first round match.

She modelled the flared, shift-silhouette dress set against the backdrop of the New York City skyline that inspired its design, it was reported. She also presented a custom white and black version she'll wear for day matches.

Last year, Sharapova began taking on-court wear to a new level by competing in custom dresses designed specially for her day and evening matches.

For Maria's night matches, designers worked with her to create a knee-length atomic red dress with a simple, flared shift silhouette in ultra lightweight Dri-Fit jersey, Nike said. For day, there is a classic black and white dress with a simple, flared shift silhouette also done in an ultra lightweight Dri-FIT jersey.