Answered my own question:
Jul 25 Wells was a late scratch from the lineup before Monday night's series opener against the Seattle Mariners after tweaking his back during batting practice. The 27-year-old Blue Jays center fielder said his back was a little sore Sunday in Toronto and it locked up during the first round of batting practice Monday. The injury isn't considered serious, and Wells said he expects to play Tuesday.
Except he ISN'T playing Tuesday.