no clue, just saw he's pulled out. He at least probably would've won a round, which is worth a few points, and he has points from last year to defend so his ranking will drop even more.
This is 4 times I've gone to a regular non-davis cup tournament and now 4 times Taylor has pulled out right before hand
Edit: Yep his back... from the LA Times
"The men's draw suffered one loss when Taylor Dent withdrew because of an ailing back. Dent, scheduled to play wild card Sam Querrey in the first round, will be replaced by Bobby Reynolds."