In his latest post-match press conference, Rafael Nadal explained why he changed his service motion back to the old one in the past few matches:
It’s my normal serve. For a set number of weeks since Barcelona, I came back to my prior serve. I needed a bit more confidence. Mentally speaking, when you’re not perfectly on the spot, I had to recover somewhat.
I know that the service I had used before the clay season, before Barcelona, that this service is positive. I had served very well in Australia, Indian Wells, and Acapulco… and it gave good results. But here on clay, things are different. That’s why I came back to my prior serve.
After Roland Garros Rafa will again switch to the new service motion (the same he used at the from Australian Open) so that he can produce more velocity and immediately put opponents under pressure.