Wimbledon performance delights Novak Djokovic

World number one Novak Djokovic has revealed that he is pleased with the way that he has played so far at Wimbledon this year.

The Serbian is yet to drop a set in any of his matches at SW19, the latest of which saw him overcome Tommy Haas thanks to a 6-1 6-4 7-6 victory last night.

"It's been a great performance for me so far. I've been playing really well as the tournament is going by," he told BBC Sport.

"Last night I had Tommy Haas who I had never won against on this surface but came up with a top game when I needed to.

"I got a lot of returns back and I was serving efficiently which helps me be aggressive."

He will take on Tomas Berdych for a place in the semi-finals.