Royals call up pitcher Walter Pennington

The Royals have promoted pitcher Walter Pennington from Triple-A Omaha and have activated Adam Frazier from the Injured List. To make room on the roster, Carlos Hernández and C.J. Alexander were optioned to Omaha. The Royals made room on the 40-man roster for Pennington by transferring pitcher Dan Altavilla to the 60-day Injured List for his oblique injury.

Pennington hails from Broomfield, Colorado, about 30 minutes north of Denver, where the Royals play tonight. He attended the Colorado School of Mines and signed with the Royals as an undrafted free agent. This year, at the age of 26, he was enjoying his best pro season with a 2.35 ERA for Omaha with 76 strikeouts and 19 walks in 53 2⁄3…