Ryan Sloan, the Mariners’ 19-year-old right-hander in his first season of pro ball, is quickly building a reputation as Seattle’s next great pitching prospect.

The D-backs have agreed to trade first baseman Josh Naylor to the Mariners in exchange for left-handed pitcher Brandyn Garcia (Seattle’s No. 13 prospect per MLB Pipeline) and right-hander Ashton Izzi (No.

Despite already helping the Seattle Mariners out on the big league roster, Keith Law says Cole Young is their most trade-able prospect.

For most of the season, the main talking point for top 100 Seattle Mariners prospect Lazaro Montes has been his power. He flashed the glove in a web-gem play for the Double-A Arkansas Travelers. In the Travelers' 3-2 loss against the Northwest Arkansas Naturals on Wednesday,

The Seattle Mariners could be big-time buyers at the trade deadline, but it might cost them one of their better prospects.

Mariners No. 10 prospect Tai Peete belts his 16th home run of the season, a three-run homer to right, for High-A Everett

The Seattle Mariners have traded for first baseman Josh Naylor from the Arizona Diamondbacks in exchange for left-hander Brandyn Garcia and right-hander Ashton Izzi, the team announced Thursday.