Many great players employ a combination of two or even three different styles. For example, Stan Wawrinka, who is said to have one of the most powerful single-handed backhands ever, can hit extremely flat backhands, but can also apply top-spin to them. Stefan Edberg in the past, along with Roger Federer and Grigor Dimitrov are able to apply all three, using the slice, flat and top-spin backhands effectively. This variety makes it hard for the opponent to guess what kind of shot they are going to play.