I don't fear Nadal, his game sucks for what I saw.
His game also sucked at R.G. last year yet it was enough to take care of an in-form Federer. Nadal may be declining but Fed has been for years and I have no confidence in his ability to defeat Nadal outdoors any more, except on genuinely fast hard courts such as Cincinnati's & perhaps the U.S. Open's (though not last year), & possibly on grass, fluctuations in form notwithstanding. Form is temporary, match-up nightmares & mental scars are permanent.