Rogers Cup (Toronto Masters Event), Who Will Reach The Semis?

With the Rogers Cup in Toronto starting today who are the players to watch? With Roger Federer and Raphael Nadal both playing it should really be both of those 2 players in the semi finals, but what other 2 players are going to join them? Looking at the draws I really think we will see both Tommy Haas come through the draw to play Roger in the semi, and I think Wawrinka also has a chance to sneak through the Djokovic section of the draw to play Rafa in the other semi.

Who else might have a chance of making the semi finals in the Rogers Cup? You can find the single drawsheet here.