SEATTLE -- Mariners reliever Tyler Olson was recently optioned to Triple-A Tacoma, but that move has been rescinded, and Olson has been placed on the Major League 15-day disabled list.
Olson, who made the club out of Spring Training as a left-hander in the bullpen, was pitching in the Mariners' 11-4 loss to the Astros in Houston on May 2 and sustained a right knee contusion when sliding to cover first base on a Jake Marisnick infield single leading off the bottom of the fifth inning.
Olson went on to finish that inning and two more, but he will go on the DL retroactive to May 3 and will be eligible to return on May 18.
Doug Miller is a reporter for MLB.com. Follow him on Twitter @DougMillerMLB. This story was not subject to the approval of Major League Baseball or its clubs.