For me to become a Carlos fan, he has to truly become #1 in the sport in an undisputed way in his era. After becoming a fan of Sachin Tendulkar to Ronaldo to Djokovic, my fan following isn't coming at less than that. It comes when you give consistent results for some years. Otherwise I am a fence sitter.
Stan was my inspiration to get back into tennis (watching and playing).
Out of the Big 3, appreciate Fed's style the most. But my g/f is from Madrid, so I have to support Nadal with her lately. And Alcarez is the heir apparent in Spain!