I'm better than 2011 - Djokovic

Novak Djokovic says he is in better form than in 2011 when he won his only Wimbledon title, after easing through to the quarter-finals.

The Serbian world number one enjoyed a straight sets fourth round win over Tommy Haas, 6-1 6-4 7-6 (7-4).

Djokovic faces Tomas Berdych in the last eight, an opponent he lost to on Centre Court in 2010.