Mark Buehrle had an MRI!

Here's part of an article from BPro, this is the first I've heard that Buehrle had an MRI:

"It's hard to say that going deep into the playoffs has a downside, but there is something to the idea that the extra innings and shortened off-season can cause problems. The White Sox put a big load on their pitchers during last year's World Series run. Given that, it's little surprise that there's some fatigue issues with the staff. Mark Buehrle and Bobby Jenks are having problems that, for the most part, have to do with the junction of conditioning and fatigue. Buehrle had a precautionary MRI on his lower back, but there was no structural damage found and, surprisingly, Buehrle is still on track for his next start."