I've been hearing some talks about Isner in good form this tourney but I don't buy into it much. If you examine the wins that Isner has so far, he's basically beaten nothing but washed up/has been players in Verdasco, Lu, and Davydenko.
Gulbis on the other hand had to fight off the future of tennis in Dimitrov and a very hot Bautista-Agut. I find more weight in those wins than Isner's road so far. We all know that Isner has that monster serve but so does Gulbis. Gulbis has a powerhouse serve as well and if needed, he can go toe to toe with Isner's serving.
I also trust Gulbis return abilities much more than Isner's. Sure Isner will have the home crowd but I think crowd support doesnt come heavily into play when you have short and rapid serve points like we will see today. Matter of fact, the more Isner hits aces, the less crowd advantage he'll get because it will be a boring match and crowds love long rallies.
Take GULBIS -150 .......it's a solid bet. Good luck fellas.