Rafael Nadal, knocked out of Wimbledon in the second round last week, is to take two weeks off because of tendinitis in his knee. The Spaniard will miss a charity match against world number one Novak Djokovic in Madrid’s Bernabeu stadium on July 14 but hopes, however, to have fully recovered in time for the July 27-August 12 Olympics in London. “I want to apologise to all, in particular to the fans that had already purchased a ticket to such a good cause, but unfortunately we won’t be able to play for the moment that match in Madrid,” he said. “The doctors have been checking my knee and I suffer a tendinitis which will have me away from any practice or matches for 15 days, which makes it impossible to play with Novak Djokovic as we’d expected and announced.