Rafael Nadal looked hampered by his injured knees during a 6-4, 6-3 loss to Lleyton Hewitt in an exhibition Thursday. He will decide Friday if he can defend his Wimbledon title. Nadal played without tape on his knees but frequently appeared a step slow on the grass court at Hurlingham Club. This was Nadal's first match since his loss to Robin Soderling in the fourth round of the French Open. More...