I've said it twice, but I'll say it again.
Berdych on hard courts = lurking threat.
He took out Fed at USO, he took the first set vs Nadal last year and threatened with set points with a two sets to love lead.
However, considering how well Djokovic has been playing it'll take a miracle or a considerable fall in quality for Berdych to be able to beat him. Nevertheless, a Berdych win would be exciting for the top half of the draw.