While just about everyone hits from the baseline, the contrasting styles has shifted from baseliner vs serve/volleyer to offensive baseline vs counterpuncher.
Offensive baseliners(big serve, big forhand) being roddick, j. johansson, phillipoussis, ancic, etc.
Counterpunchers(return of serve and chase down ball) being grosjean, hewitt, agassi, rochus, coria and several claycourters.
Federer is the only true allcourt player I can think of. Is there an all-court player that I haven't heard of that I should follow?
"Intellectuals solve problems, geniuses prevent them."- Albert Einstein