Serbian tennis star Ana Ivanovic is entering the US Open today with confidence. “Obviously, there is a little bit of nerves involved, but I really feel like I’ve been playing well the last few weeks,” she tells Yahoo Beauty. Currently ranked No. 7, the 27-year-old already has a French Open win and previous No. 1 ranking under her belt, and is psyched to take on Serena Williams this week. At just five years old Ivanovic already knew she wanted to be a tennis star, but she didn’t anticipate being pushed into the spotlight.