We'll keep track of the day's minor moves here: Jack Armstrong, a 2011 third-round choice of the Astros, has hung up his spikes, reports Evan Drellich of the Houston Chronicle (Twitter links). Selected as a pitcher and given a $750K signing bonus, Armstrong never even got on the hill professionally due to a series of arm injuries. He had been hoping to switch to first base. 2010 Red Sox first-rounder Kolbrin Vitek has retired, reports Alex Speier of WEEI.com. Injuries slowed the toolsy player, who never managed to translate his raw abilities into production. As Speier notes, however, several other...

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