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Pena was added to the Astros' 60-man roster Tuesday, Brian McTaggart of MLB.com reports.
Pena was a non-roster invitee during spring training this year, but he wasn't included in the player pool during summer camp. However, he'll now head to alternate camp in Corpus Christi for developmental purposes to finish the season. The 22-year-old has flashed impressive speed and defensive abilities in his short time in the minors.
