Dent had back surgery about a year ago, he has not played since then, so that's why he has no ranking. Apparently it was MUCH worse than anyone had originally anticipated. He played a couple exhibitions at the end of the year and had entered Hopman Cup, etc., but apparently his back is not cooperating. He's now apparently working as a 'coach' at Bollettieri's and is out "indefinitely" according to The Tennis Channel.... it's looking more and more like he might not come back at all.
And Coria? Surely a player that was once ranked #3 and consistently qualified for the Tennis Masters Cup should at least be able to return to the Top 20?
So whats the problem with him?