In reply to nathan79:
It's possible that he hasn't fully recovered from the illness (Shingles) that affected him at the Aus Open
Or that a burn-out of sorts was inevitable after his stunning 6 months last year
But Djokovic is also off-form, Nadal is back to his best on clay and it seems Federer is favourite for Wimbledon !!!
The tournament is wide open, but you can get Stan W at 25-1 looks good value if you're a betting man (which I'm not)