Will it be one of the other top 4? Will it be someone like Tsonga or Delpo who hasn't maximized their potential yet? Or will it be one of the new kids on the block like Raonic? Or perhaps right now there is no one that inspires you so you will support no one until the next star comes along? PS - The assumption I'm going to make is that Rafa/Nole/Murray retire after Fed, although there is a chance Fed keeps playing till he's 35!