Double-A Tulsa lefthander Edwar Cabrera doesn't have a big fastball. Nor does his breaking ball catch the attention of scouts. What the 24-year-old Rockies prospect does have, however, is perhaps the best changeup in the Texas League.

While Cabrera muscled his way onto the prospect map in 2011 when he fanned a minor league-best 217 batters, he has kept the attention of prospect watchers this season by running his strikeout-to-walk ratio to 29-to-3 and dampening his ERA to 1.64 through his first five career starts at Double-A.

He delivered seven shutout innings against Springfield on Saturday, striking out seven, walking none and allowing a mere two hits. Cabrera cut through the Cardinals lineup despite the fact that, in the words of Drillers manager Duane Espy, the southpaw didn't have access to his best stuff.

"I didn't think (Cabrera's) curveball was really any kind of good pitch for him, so basically he was a fastball-change guy," Espy told the Tulsa World.

Cabrera sells his low-80s changeup with good arm speed, while he cuts his 89-91 mph fastball in on righthanded batters. They collectively have hit just .110 versus Cabrera this year (minor league splits), while faring little better last season, when Cabrera faced 566 righty batters and held them to a batting line of .231/.281/.382 (though with 17 homers allowed).