When Borg declared Nadal as the pre-tornament favourite, he only said what was visible; to everyone. Federer had undergone a slum hitherto unheard of, and Nadal, had not just thrashed Federer in Paris, but had also managed win a title on Grass. Borg was perfectly justified in his opinion. Now, he has changed his mind. He has every right to change his mind. There is an old saying; that a person who never changed his mind, never had any mind. It goes to credit of Federer, that by virtue of his flawless tennis, he has forced a change of mind on no less a person than Borg. Borg nowhere prophessed that Nadal would win. He just said that Nadal was the favourite. If Federer has played perfect Tennis, Nadal has played awesome Tennis. The way he simply cast aside crowd's favourite Andy Murray, had to be seen to be believed. There are some though, for whom, Nadal is still the favourite.
