I'd probably give Robredo a very slight edge in this one, alhough he has struggled with this type of match-up many times before and his form is far from convincing.
The major advantage for him, though, is that if he can be competitive from the outset he could win by physical means. Stakhovsky's fitness is often questionable, and if the forecast remains decent then he probably won't enjoy the prospect of playing maybe 4-5 sets out there. It also helps that the courts aren't the fastest.
Yee, agree. However, this time Stakho devoted all last December to fitness (two weeks in the mountains and two weeks in Thailand, last case is together with Youzhny) and now looks more fresh and energetic than usually. So, we will see