Average Saves, by team win total
A rough approximation for the number of saves a team should expect by their win level would be 30 + (Wins-60) * 0.5. It wouldn't work for teams under the 60 win mark, but there aren't many of those anyway. I have the lowly Orioles projected at 65 wins, and nobody else less than that.
Keep this in mind for fantasy drafts. There isn't too much of a difference in save opportunities for pitchers on bad teams. The good teams tend to win blowout more often, and take the save out of the equation.