Gulbis has far more raw talent and power out of those two players so he should win.
that's why i put "shouldn't" in quotes. Because by rankings standards, he is the underdog.
From what I witnessed that night at the Open, Gulbis has more raw talent and power than anyone other than Federer and Fernando. Does that mean he "should" beat Djokovic, Nadal, and Davydenko, etc. head-to-head? Certainly not.