In my opinion, Saretta and Sa have an almost equal shot against Enqvist. None of them would be the fave to win. Thomas is not on the best of his form, but he would have a big edge on indoors against any of the two.
Therefor, I would put Saretta to taste a big match for the first time and let Sa fresh for the doubles.
I´d love if Guga could play first, and maybe against Bjorkman. If he can score a win (tough, but not at all impossible), the next to play could be Flavio, with not a big pressure.
If they go on a 1-1 to the doubles day, I´m happy. I trust Guga-Sa as a team, and we could take it all to the third day.
It´s tough, but that´s the scenario I see happening.