WASHINGTON, DC - JULY 21: Sean Doolittle #63 of the Washington Nationals pitches against the Baltimore Orioles during the seventh inning at Nationals Park on July 21, 2020 in Washington, DC. (Photo by Scott Taetsch/Getty Images)
On Thursday morning, the Mariners made a move to bolster their bullpen depth while at the same time adding some playoff experience to the roster. Sean Doolittle was claimed off waivers from the Cincinnati Reds Thursday morning. In a corresponding roster move, recently optioned reliever Keynan Middleton was designated for assignment.
Sean Doolittle has had a decent season for the Reds up to this point.