Sharapova, De Niro add star power to Serbian's supporters

Russian tennis star Maria Sharapova, aswell actor Robert De Niro added celebrity status to the supporters' section for Serbia's Novak Djokovic in Sunday's US Open final.

"Let's not go too much with Maria," Djokovic said. "It's just a friendship we have."

Djokovic, known for his joking impersonations of Sharapova and other tennis players, bumped into Sharapova during a Fashion Week event ongoing in New York at the same time as the year's last Grand Slam tennis tournament.

Djokovic, who has a girl friend, struck up a friendship with Sharapova this week and invited her to join his parents in their seating section.

"It was nice for her to come and support me. As well Robert," Djokovic said. "It's an amazing feeling to see such successful people in my box supporting me, playing with me I can say, living every emotional moment. It's great."

Asked what Sharapova thought of his impersonation, complete with exaggerated moves like smoothing hair, Djokovic joked, "She said she's going to kill me.

"Of course she accepted it in the right way. Of course she found it funny. Not offended."