Rafael Nadal (ESP)  vs Marin Cilic (CRO) . This is the only quarterfinal match-up that was predicted to occur at the beginning of the tournament if results followed the seedings. In a tournament with lots of upsets it is significant that this match-up persisted. Nadal is playing excellent tennis and has only lost one set in four matches while Cilic has lost 2, one against Pablo Carreno Busta and another against Vasek Pospisil. The main problem for the hard-serving Croat is that he has played Nadal 6 times before and only won 1 match (and 3 sets out of 14 played) and half these matches occurred after he became a major champion himself. In fact, he has lost their 5 meetings in a row, including their one grand slam meeting, which was in Melbourne in 2011. That being said, Cilic does believe that he can beat Nadal and he has the game that could do it as well. I suspect he will win at least a set, and possibly even two but I don't see how he wins three. Mad Professah's pick: Nadal.
Grigor Dimitrov (BUL)  vs Kyle Edmund (GBR)
Tennys Sandgren (USA)
Roger Federer (SUI)  vs Tomas Berdych (CZE)