The players against the authorities, he wanted proper consultation. Serena and federer hated it but when they won on it they both were for it. Players like to get their excuses in rather then say to the press they love it then lose. Tourniments should take no notice of players they are hypocrits.
I can't speak about Serena, but Federer has never liked the blue clay even after he won the tournament. The difference is, Federer played on it without letting it get to him mentally, and generally crying about it, like Nadal and Djokovic did.