Nadal hopes to be healthy by Olympics

Rafael Nadal is unsure whether his sore knee will be at 100 percent by the time London Olympics begin. After being upset by Lukas Rosol in the second round of Wimbledon, Nadal pulled out of a exhibition against Novak Djokovic in Spain to rehabilitate the injury. He won the gold medal in 2008.

"I am doing everything possible to recover," Nadal told the Spanish press. "After Roland Garros I had a difficult time, but the excitement is at its maximum, I am working as hard as I can and hopefully I will be at 100 percent. I am the one who is most worried. I hope that things improve and my intention is to arrive in London well prepared and recuperated. It is for this that I work every day. Carrying the flag will be something unforgettable."