Rafael Nadal opens up to Carol Costello on his new book, tennis, his personal life

He's the U.S. Open defending champion and the #2 tennis player in the world.

Rafael Nadal is getting ready to defend his title in this year's U.S. Open, which starts this week. At the same time, he has also released a new book titled "Rafa."

CNN's Carol Costello sits down with Nadal to talk about life on and off the court, his biggest passions and fears.