Wimbledon 2013: Novak Djokovic refuses to underestimate Tommy Haas as second week begins with a bang

Tommy Haas is playing some of the finest tennis of his life, but Novak Djokovic knows that will not be enough if he plays to his best. The pair close Centre Court today as the second week at Wimbledon gets off with a bang. Haas will be world number one Djokovic's toughest opponent at the All England Club to date, although the 13th seed is as long as 9/1 for victory with some...