"Roger [McDowell] is there for you when you need some help," Minor said. "Late last season I struggled with my curve ball and he really helped."
I point this out because Minor's curve ball was one of his out-pitches, and he was using it very effectively when he first came up, but in his later starts he seemed to use it less and less.
On the FanGraphs PitchFX page you can see that he used his curve more often than any other pitch in his fifth start, which was his worst start to that point in the season. He then used his curve less and less as the season went on.