Nishikori and Ferrer are two different balls of wax.
Ferrer and Djokovic are two of the same exact player with one difference. Djoker has put away weapons from anywhere in the court. Ferrer has to set you up.
Ferrer and Federer's script is well established, and Ferrer and Nadal on clay is established. Anyone else, it really isn't. As Veronique said, Djokovic HATES wind, and it doesn't even bother Daveed. That match could be really interesting.