Michael Arroyo did not record a hit in his MLB debut, but three revealing moments gave the Mariners plenty to work with.

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With their postseason hopes fleeting, the Mariners made a move on Sunday that signaled towards the future: promoting top hitting prospect Michael Arroyo to the Majors. Ranked the club’s No. 3 prospect and MLB Pipeline’s No.

MLB expansion could move Houston and Texas out of Seattle’s division, add Portland and give the Mariners a true geographic rival.

The lackluster play of first baseman Josh Naylor is a significant reason why. "The other major offseason move the Mariners made was re-signing Josh Naylor to a five-year, $92.5 million deal. What stood out about this contract was not only that it made a lot of financial sense,

Seattle Mariners Executive Vice President & General Manager of Baseball Operations Justin Hollander announced today that utilityman Michael Arroyo has been promoted to the Mariners’ MLB roster from the Triple-A Tacoma Rainiers.

There are just a few weeks left to go in the 2026 Major League Baseball regular season.