You need to realize that Cipolla's best surface is hardcourts.
Even with that said and with Cipolla showing some superb form and defensive skills in that 1st set vs Nishikori. Dolgopolov will be too much on serve, he can match the heavy slices from Cipolla. In fact we should see some great slicing going on with the slices these 2 can get on the backhand. I think Dolgopolov will be lethal at the net and Nishikori was just bricking volleys. Cipolla can get a set though but he needs to be serving at a very very high % because Dolgo will absolute destroy the second serve. It will be like hitting a baseball off of a tee almost, I'm gonna go with Dolgo in 4 because of how much Cipolla impressed me