Glasnow returned from an ankle injury in mid-June, firing off a couple of inconsistent rehab starts for Class A Short-Season West Virginia before posting a 3-1 record over six appearances for Double-A Altoona.
The Pirates drafted Glasnow, 21, in the fifth round of the 2011 Draft. He "has the ability to blow away hitters on a consistent basis" with his fastball, according to MLBPipeline expert Jonathan Mayo, and the 6-foot-8 righty has proved it this season with 122 K's against 36 walks.
Alex M. Smith is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.