PHILADELPHIA -- The Phillies added bullpen depth Monday when they claimed left-hander Zac Curtis off waivers from the Mariners.
Curtis, 25, allowed three unearned runs in 4 2/3 innings in three appearances this season with Seattle. He allowed three hits, one walk and struck out two. He posted a 3.51 ERA in 41 appearances with Double-A Arkansas, striking out 60 and walking 19 in 51 1/3 innings.
Curtis had a 6.75 ERA in 21 appearances with the D-backs in 2016. Arizona traded him to Seattle in November in the Jean Segura/Taijuan Walker deal. Curtis will wear No. 52.
The Phillies placed right-hander Jesen Therrien on the 60-day disabled list to make room for Curtis on the 40-man roster. Therrien has an ulnar collateral ligament injury in his right elbow. He could require surgery.
MLB Network's Jon Heyman tweeted that the Phillies will promote Triple-A Lehigh Valley right-hander Henderson Alvarez. The Phillies recently signed Alvarez to pitch for the Lehigh Valley IronPigs. He posted a 2.84 ERA in three starts.
Todd Zolecki has covered the Phillies since 2003, and for MLB.com since 2009. Follow him on Twitter and Facebook and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.