In the lower half of the draw, Nadal and Nishikori have an easy route up to the clash in the semifinals.
In the top half of the draw, Wawrinka can find at the quarterfinals Goffin or Kyrgios, instead who win between Federer and Del Potro reach the semi finals easily.
Its most likely that this will happen. If Nadal does meet Nishikori, I think its easy for Nadal to beat him. Nishikori has always had a hard time cracking top 4 players and his struggle will most likely continue. Kyrgios will most likely beat Goffin and in the semi's it will be a hard battle between Kyrgios and Wawrinka. Cant wait for Del Potro vs Federer match up.