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The US Open begins next week and we’ve got a sneak peek at what all of the top players will be wearing for the tournament! Maria Sharapova, Rafael Nadal and Roger Federer will join John McEnroe at a charity tennis event tonight in N.Y.C., where they’ll officially unveil the custom daytime and nighttime looks from Nike that they’ll be hitting the court in. We’re loving the teal dress with flirty ruffle Sharapova designed for her daytime look (left). Click through the gallery below to see her nighttime look, plus Nadal and Federer’s Nike designs.