One of the Seattle most often-used relievers will be on the injured list for an extended period of time. In a 6-0 win against the Texas Rangers on Thursday, Mariners right-hander Trent Thornton stumbled off the mound while attempting to cover first base on an infield single in the top of the ninth. Thornton clutched his left ankle after falling and briefly tried to stand before laying back down on the grass. Seattle confirmed the injury was a torn left achilles tendon and placed him on the 15-day injured list Friday.