If you don't already know, J.A. Happ has pitched for the Blue Jays (2012-2014)
He had an ERA of 4.39 with a win loss of 49/50..
No offence Mr. Happ..but not stellar numbers..
Fast forward to 2015 after his trade to Pittsburgh.
In 11 appearances he posted a 1.85 ERA (3rd lowest after trade deadline) and a 7/2 win loss
It's understandable why he had at least 12 teams interested in him this post-season