ABSTRACT
Aggressive game style dominates modern tennis. Almost all professional players use every opportunity to open the court as soon as possible (usually with a serve or return) and put their opponents into a defensive position. Players who try “just to hit over the net” can hardly compete at a serious level. Despite the similarities between all players it is known that usually different players have won the most important tournaments played on fast (e.g. grass) and slow (e.g. red clay) surfaces.
