From fangraphs a few days ago:
"Selected by Detroit in the 13th round out of Florida State in 2012 — and the recipient of a nearly slot appropriate $200 thousand bonus — Travis dramatically outplayed his pedigree in the minors, largely on the strength of his contact and (it would seem) batted-ball skills. Those two qualities, in conjunction with his ability to play second base, conspired to earn for him a basically league-average projection before the season.
Over his first 49 plate appearances, Travis has essentially retained his strikeout rates and batted-ball figures from the minor leagues while also exhibiting power. The projections and reason dictate that the latter two of those three variables are candidates for substantial regression. The collection of skills, however, still points to a league-average rookie season. A substantial accomplishment, that."
http://www.fangraphs.com/blogs/easily-digested-commentary-on-some-notable-debuts/
I've paid close attention to Travis a lot and I don't recall him having too much trouble on any pitches in any zone. Unfortunately the heatmap does not seem available for him on fangraphs.