Who knows, giraldo obviously the better player when on and he has been in recent matches so i'll go with santiago.
I wasted a couple hours of my life watching Giraldo - DGT yesterday, and he was definately not on. At least from when I started watching at 41. Giraldo pushed throughout, and was pretty lucky getting the victory so easy. It didn't look like any of the players were acclimated to hard courts, and the reason he won was simply that Gimeno mistimed more shots than Giraldo. Of course saving 5/5 and taking 3/3 was very strong, but most of the points were horrible misses from Gimeno.
If Montanes played like he did at the end of the last season, I expect a routine victory. Of course Giraldo may again find his punishing strokes...