If memory serves Wells Aug 92, Doc Apr 99/00, and Carpenter sometime in 02. I wonder where Sanchez's month ranks?
Here you go, christaylor!
So: was Aaron Sanchez' performance this June the worst month ever by a Blue Jays starter?
Could be, could be. I went scooting through the archives looking for every Jays pitcher who had made at least 3 starts in a calendar month and posted an ERA of 9.00 or higher while doing so. (This occasionally involved digging into the actual Game Logs, because it turns out that when you give up that many runs, they sometimes send you to the bullpen.