Roger Federer says 'Big Four' rivals Andy Murray, Novak Djokovic and Rafael Nadal will still pose a major threat to his Wimbledon hopes, despite questions around each of them.
The Swiss, 35, is the bookmakers' favourite to regain the title he last won in 2012.
Defending champion Murray is struggling to recover from a hip injury.
"If he's anything close to 100% physically, I consider him one of the big favourites," said Federer.
"It's that simple. It's the same for Novak and the same for Rafa."
Djokovic, a three-time champion, won only his second title of the year in Eastbourne on Saturday after a poor 12 months by his standards.