Roger Federer issued Novak Djokovic 'twice as strong' warning ahead of ATP Finals

Novak Djokovic is “twice as strong” as he has ever been before, insists tennis commentator Annabel Croft ahead of the ATP Finals. Croft told Sky Sports: “He went into such a deep decline after losing that top spot. “He's going to be one of the few who have come from such a low ranking and now to be back at number one on Monday is going to be absolutely extraordinary. “Tennis is not easy, but when you go to the depths of despair and you find a way to build yourself back up again, he almost looks twice as strong as he has ever looked before. “What a record he has already achieved in his career and who knows what he might go on and achieve. “I did not see what he achieved this year coming. I thought it was going to take him a lot longer to get back.”

No early meeting for Novak Djokovic and Roger Federer at the ATP finals