I watched his first round match in Madrid, Serra played well, but Rainer was really poor. He was not happy at all about the conditions - the courts in Madrid are terrible, at one point he went to the chair umpire and told her "please tell me how we are supposed to play tennis on those courts?! The clay is so soft, it's impossible to play here!" I guess the main courts are better, but I spent most of my time on the small courts since there are no livestreams for those and all the players were pissed off by the bad bounces. Rainer even more than the others, though.
Really a bad match from him, but at least he was still very nice with the fans after the match, threw tons of things in the (small) crowd, signed a lot for the kids, etc. He was remarkably nice for a player who had just lost a match.
You can see a few pics here: