Rafael Nadal drags out of wimbledon with knee problems

Murray has been paired in the first round with American robert Kendrick. Alternatively, Nadal's station on the crown business of the draw was filled by the fifth seed, argentina's Juan martin del Potro. "I'm just not 100 per cent," said Nadal, who won the golden Challenge Cup final summer when he beat Roger Federer in 5 sets in what was viewed as the greatest mates that was worked at wimbledon. Nadal had been drawn to open his tournament following week against france's Arnaud clement. The 23 year-old has had awful knees for several months, and missed last week's warm-up tournament at Queen's Club.