SEATTLE -- The Mariners added another left-handed reliever to the mix on Thursday, claiming 25-year-old Sam Moll off waivers from the Pirates.
Moll pitched 11 games for Oakland in September,. He was designated for assignment by the A's on Nov. 20, and he was claimed by the Pirates on Monday. He now joins Seattle's 40-man roster, which sits at 37 players.
• Hot Stove Tracker
The only other lefty relief specialists on the Mariners' 40-man roster are James Pazos and Marc Rzepczynski, though Ariel Miranda, Andrew Albers and Marco Gonzales are also bullpen contenders if they don't make the starting rotation.
Moll had a 10.80 ERA in 6 2/3 innings with the A's in his first stint in the Majors, allowing eight earned runs and 13 hits with seven strikeouts and three walks. He also threw seven scoreless innings in six appearances for Triple-A Nashville, but he spent most of his season in Albuquerque, where he had a 4.18 ERA in 44 outings for Colorado's Triple-A affiliate.
The A's acquired Moll from the Rockies on Aug. 16 in exchange for a player to be named later or cash considerations. After throwing seven scoreless innings for Nashville, he was a September callup for Oakland and made his Major League debut on Sept. 1 at Seattle, retiring the only batter he faced.
In five Minor League seasons with Colorado (2013-17) and Oakland ('17), Moll went 9-10 with a 3.35 ERA, four saves and 201 strikeouts in 215 innings over 151 games, including six starts. He was selected by Colorado in the third round of the 2013 Draft out of the University of Memphis.