The men's QF field is set. The upper half of the draw has the straightforward matches. Djokovic and Murray should easily beat Tomic and Lopez in straight sets respectively.
Meanwhile, the lower half of the draw has the intriguing matches. Both Berdych and Raonic are playing good tennis right now so they could both potentially beat Federer and Nadal respectively if they continue to play good tennis. In addition, one player in the lower half of the draw has to play three straight days just to win the title. So, it will be interesting to see if the four players in the bottom half will try to win quickly knowing they have to play three days in a row to win the title.
All in all, I think the Big Four will prevail and we will have a Big Four semifinal matchup on Saturday. Interestingly, this has not happened since the 2012 Australian Open.
On a side note: I want to say a BIG congratulations to Feliciano Lopez. At age 33, it looks like he is playing his best tennis of his career! You know somewhere Judy Murray is happy that Lopez is playing Murray :snicker