Mine would actually be like Andy Roddicks' (and, no, I don't mean I seriously play anything like him, I just mean in terms of a general style.)
I suppose because he just had a big impression on me when I got into tennis as a late starter and he was starting to make waves in tennis. In contrast to someone like our own Tim Henman, I did find him quite charismatic and exciting to watch. I certainly studied him a lot... the abbreviated serve (of course), the fh (in depth), that style (er, hit from the b-line like a headless chicken and just waft over that 2hbh as rarely as is permissable - ha, ha.) I even played the same frame as him then (PD+)...
So, slightly embarrassing perhaps, I don't know, but that's the pro player who I maybe most resemble in terms of my game.
How about others?