Dugger, 25, was an 18th-round pick of the Mariners back in 2016 who was traded to the Marlins in the deal that brought Dee Strange-Gordon to Seattle. Dugger made his big league debut in Miami but didn’t find much success in parts of two seasons there, posting a 7.40 ERA with a 13.7 percent strikeout rate and 9.4 percent walk rate in 45 innings. Dugger’s struggles have persisted in Triple-A, although he had a solid track record up through the Double-A level, where he owns a 3.60 ERA with solid strikeout and walk numbers through 180 innings of work.
Seattle claimed Dugger back from the Marlins in early December when Miami designated him for assignment, and the Mariners will now have a week to trade him or pass him through outright waivers. If he goes unclaimed, Dugger would remain with the organization (without the 40-man spot) and likely return to big league camp as a non-roster invitee.
The pair of moves leaves Seattle’s 40-man roster at capacity, although since Giles is recovering from Tommy John surgery, he could be placed on the 60-day injured list to open a spot if the Mariners make another late addition.