As someone who suffers from extreme chronic pain that is variable day by day then I say it's quite possible to have an ongoing health issue that means you can be fine one day and wrose on others. I think in Rafa's case you can study when he's had issues and be able to cite exhaustion and the wear of his schedule. He's had a good year this year with a lot of work in and I think with his knee's it#s just the sort of thing that flares up and can be fine for a while and then get worse.
There's never be any proof to any of these rumours and most these journalists and critics seem jealous and unable to fathom that these players can actually play tennis that is out of this world.
Take last year for Nole- rumours and speculation of doping because he had a stunning year 'out of the blue' when in fact those of us watching tennis week in week out were seeing a difference in attitude on and off-court towards his tennis.
The same can be said about Andy in this years Wimbledon and Olympics, his entire game moved up a gear with his attitude and confidence at an all time high- so should we be speculating about him and doping?
I'm not saying it doesn't happen but I hate that for every injury or withdrawal there's speculation of substance abuse; that every time a player achieves a major victory in spectacular fashion then the same happens.