Boomquist was designated for assignment Thursday, Jon Heyman of CBS Sports reports. The Mariners needed to make a move to clear a roster spot for shortstop Chris Taylor, and the 37-year-old Boomquist is the casualty. Bloomquist played seven-and-a-half seasons with the Mariners, but his effectiveness has diminished of late, and he no longer holds much value as a pinch hitter and utility defensive player. Bloomquist will be subject to waivers and is unlikely to return to Seattle. He took to Twitter on Thursday afternoon to express his gratitude to the Seattle organization.