Spainish tennis star Rafael Nadal has pulled out of the London Olympics, stating that he is "not in condition" to compete. Nadal said that the decision to pull out of the Summer Games is one of the saddest moments of his tennis career. Nadal aggravated his knee during his second round loss to Lukas Rosol in this year's Wimbledon. He has not played since the loss. Nadal was set to be the flag bearer for Spain for the opening ceremonies. He was set to defend his gold medal won in the Beijing Olympics in 2008.