Light was claimed off waivers by the Mariners on Saturday, Ryan Divish of The Seattle Times reports.
Light was designated for assignment by the Pirates on June 10, but his passable 3.76 ERA with Pittsburgh's Triple-A affiliate caught the Mariners' eye. He has a live arm, routinely sitting in the mid 90s with his fastball, although he hasn't been able to translate any of his minor-league success to the big leagues. To make room for him on the active roster, Ryne Harper was designated for assignment.