Mariners Option Gregory Santos to Triple-A Tacoma

The Seattle Mariners have optioned right-handed reliever Gregory Santos to Triple-A Tacoma after a disappointing start to the season marked by control issues, including eight walks and no strikeouts over seven innings. Santos, who was acquired from the Chicago White Sox with expectations of being a high-leverage bullpen arm, has struggled to regain his previous form following injuries and has posted a 5.14 ERA and a WHIP of 2.29 in 2025. His latest outing saw him last just one-third of an inning, surrendering two runs on one hit and three walks. Will Klein, a fellow right-hander with strong strikeout numbers in the minors despite a high ERA, has been recalled to replace Santos in the bullpen. The Mariners hope Klein can provide the stability and upside Santos was initially expected to deliver. This move reflects Seattle's urgency to address bullpen performance as the team hovers near .500 in the early part of the season.