Yesterday was Ferrer's day. He played exceptionally well last night, his previous match against Nalbandian was also pretty good, but not as explosive and aggressive as this one. Nadal, on the other hand, almost quit before the opening day due to knee injury. Plus, his serve was subpar last night. One up, the other down, so there you go.
Did you watch Federer/Lopez match? Lopez played a superb 1st set, which made Fed raise his level in later sets. Fun to watch.