Ferrero, the saddest example, because the full recovery is still to be done. He travelled like crazy across the oceans in late 2003, his schedule was horrible. Then he played the French in 2004 before being fully fit again and was cruelly punished. I can't prove it, but sometimes I feel he works too hard and is overtrained, just to compensate for missing results instead of being patient. But that is easier said than done I assume.
Having said all this, I sincerely want him back