Mark Prior joins Red Sox’s Triple-A club

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Mark Prior has graduated from extended spring training to Boston’s Triple-A affiliate in Pawtucket, the team revealed Friday.

Prior will work as a reliever with the PawSox. According to WEEI’s Rob Bradford, he was being clocked at 90-92 mph in extended spring games and his curve “showed good improvement over [the] last month.”

The 31-year-old Prior hasn’t pitched in the majors since 2006 due to a series of shoulder problems. He made 11 appearances in the Yankees’ minor league system last season, amassing a 2.25 ERA in 12 innings.