No, relax. Henin-Hardenne hasn't been out for a full year, remember! She still has 2 Grands Slams to her name in the past 52 weeks along with numerous other titles. However, if she cannot come back in time for the US Open or if she does not do much there in her title defense, she will definitely lose her #1 ranking immediately following the last Major in New York. It will be lost to either Davenport (the front-runner right now), Mauresmo, or Myskina. I don't think that one of those three could theoretically get to #1 before the USO, although #2 is certainly in sight for all of them. Clijsters will lose that #2 after this week, probably to Mauresmo.