I watched Trevor May pitch a couple of times in the Arizona Fall League in 2013. He didn't appear to have a breaking ball. He looked like a pitcher who was going to wind up as a long reliever, maybe as the Twins' next Anthony Swarzak.
He had a good season as a starter at Class AAA Rochester in 2014, with a 2.85 ERA. Once called up, he contributed to the Twins' woebegone pitching with a 7.88 ERA in 10 appearances (nine starts).
I wasn't able to manage optimism on May morphing into a satisfactory big-league starter until overhearing Tom Kelly saying some good things about him last month in Fort Myers.
When Kelly sees the potential for good things, my assumption is that good things are likely to happen.
He made his second start Sunday vs. Cleveland. May went six innings and didn't come unglued when Cleveland took its shot with three straight two-out singles in the third. May's throwing OK. He's got a chance. And Sunday, he was without his curveball. Couldn't command it, so May threw fastballs and changeups. His changeup is good. Maybe the curve is going to be a bonus.