The Mets reinstated Semien (hip) from the injured list Thursday.
Semien has been shelved by a Grade 3 hip flexor strain since June 25, but after going 2-for-3 with a three-run homer during a rehab game Sunday, he's been cleared to return to the active roster before Thursday's second-half opener against Philadelphia -- well ahead of his initial 4-to-6-week timeline. The 35-year-old figures to reclaim his role as New York's primary second baseman now that he's healthy, though the Mets will keep him on the bench Thursday while Brett Baty starts at the keystone. Zack Short was designated for assignment in a corresponding move.