Random realisation: Why *is* Federer in Djokovich's half of the draw?. At the semifinal stage I would have imagined you'd like it to be 1v4 on one side, 2v3 on the other, meaning that the final match would be contested between one of 1v2, 1v3, 4v2 or 4v3. That seems preferable to having the semis be 1v3 and 2v4, with finals being 1v2, 1v4, 3v2 or 3v4.
Ultimately, cancelling out the same results, you've either got a draw with a final that could be 1v3 or 2v4, or a draw with a final that's 1v4 or 2v3. I'd personally imagine that the first draw is preferable, though.