Tennis star Serena Williams has another trophy to add to her collection: The Billie Jean King Cup. She won the award Tuesday night at the Billie Jean King Cup exhibition in Madison Square Garden in New York City, defeating her older sister, Venus, according to Williams made her big return after a nine-year hiatus from the event. The score? 6-4, 6-3. Along with the fancy prize, Williams pocketed $400,000. The 27-year-old is the number one female tennis player in the world.