The former Kansas City Royals draft pick recently played for the Seattle Mariners' American League West rivals, the Los Angeles Angels.

The Seattle Mariners bullpen will be one of ... In those outings with the Athletics and Kansas City Royals, Klein posted an 11.05 ERA with seven strikeouts in 7.1 innings pitched.

The Seattle Mariners acquired right-handed reliever Will Klein from the Oakland Athletics, the team announced on Tuesday afternoon.

Kevin Seitzer, who joined the Seattle Mariners after years with Atlanta, has embraced the analytics-driven changes in MLB.

The Mariners have acquired right-hander Will Klein from the Athletics, according to announcements from both clubs. The latter club had

A top MLB insider has offered up a bold trade idea that would see the Baltimore Orioles and Seattle Mariners swap elite prospects.

The Mariners have been known for their robust pitching development, including current big league rotation members Logan Gilbert, George Kirby and Bryce Miller. In a fun twist, when MLB Pipeline dropped its newest Top 100 prospects re-rank on Friday,

The Seattle Thunderbirds scored three goals in the second period and added another in the third to surge to a 4-1 win over the visiting Victoria Royals on Friday night. Matej Pekar tied the game ...

The Mariners fell one win short last season and need more offense but so far this off season they've added nobody

SEATTLE – The initial plan for this analysis was to offer an update on potential moves or signings that the Seattle Mariners might ... and the Royals and Tigers (86 wins) earned wild-card ...

Former Seattle Mariners infielder Adam Frazier has signed a one-year deal with the Pittsburgh Pirates, according to Mark Feinsand of MLB.com. He posted the term