Monfils plays great on home tournaments, when homecrowd gives him a "wings" and he play much more better. His defencive style is dangerous for Cililc, so Cilic can produce too much unforced errors. Monfils have a huge first service so he use it when somthing going wrong and powerful shots from the baseline, while Cilic is simply ultra aggressive player. I think Monfils has all chances to advance.