Serena Williams aiming for "new level"

Serena Williams has revealed that she is keen to take her game to a "new level" in 2014.

The world number one has won 10 titles, including the French and US Opens, this year and could add an 11th to her tally with a victory at the upcoming WTA Championships in Istanbul.

"What I think is great about it is I'm still looking to improve," she told reporters.

""What I learned most about this year is I have a lot of room for improvement and talking with my coach over it, I'm so excited for next year just to take my game to a new level."

Williams has won 17 Grand Slam titles during her career to date.