Where: At the Hamptons Magazine party at the Sanctuary Hotel in New York.

When: August 20th

What: A red laser-cut leather dress from Valentino's fall collection.

Why: This year's French Open champ shows she's a winner off the courts, too, in this edgy, but still feminine look. If she brings this much game to the upcoming US Open, we should be in for a good show.

Photo: Getty Images