I've got him on my team, and here's what CBS.sportsline.com reports - hopefully if he misses his Wednesday start, he'll just start over the weekend or somthing this week):
"News: Rich Harden, the A's No. 2 starter, is nursing a blister on the middle finger of his throwing hand that kept him from making an exhibition start Friday against the Giants. He is scheduled to throw on the side Monday, then the team has an off day Tuesday, which could allow the A's to jigger with the rotation if Harden isn't ready."
"Analysis: Track his progress, if you can. If you have to set your lineup now, we say he makes a start in Week 1 at this point. Use a healthier alternative if you have one promising enough, though."