It's silly to expect him to immediately start playing at his top level after an absence of nearly 8 months off the tour. He did really well to make the final without dropping a set and he only narrowly lost it (he was a set and a break up and, at one stage, was just 2 points away from winning it). Zeballos was playing really well and was able to exploit Nadal's rusty movement. Kudos to him.
It's going to take more than a handful of matches at a small tournament like Vina del Mar before Nadal starts to play himself into any kind of form after such a long absence. Let's wait and see how he does in the rest of his Latin American swing!
‘Oh my God, Andy, you look so sexy tonight!' (a text from Rafael Nadal to Andy Murray)