After winning his third major this year at the U.S. Open, Novak Djokovic discusses whether winning a calendar year Grand Slam is possible. Only two men—Don Budge and Rod Laver (twice)—have done it before.

"Look, if I make half what I've done this year next year I'll be happy," Djokovic said. "I do have always a huge desire to win every Grand Slam that I'm playing on. I prepare equally well for each Grand Slam throughout the year. It's a task that you really, I don't want to say that's not possible. It's possible. Everything is possible. But still, it's such a tough task to ask to win all four Grand Slams in a year. How many players did it in all history?"

Djokovic added that he would like to win the only major title that eludes him, Roland Garros. "It's something that is definitely an ambition, but it's going to take time," he said.