Class AAA, Pacific Coast League
First game: April 3, vs. Albuquerque, 7:05 p.m., Cheney Stadium.
Manager: Roy Howell.
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Key players expected to start season with Tacoma: OF Leon Landry, OF James Jones, 1B-DH Jesus Montero, LHP Anthony Fernandez.
Class AA, Southern League
City: Jackson, Tenn.
First game: April 3, at Chattanooga.
Manager: Jim Horner.
Key players expected to start season with Jackson: C John Hicks, SS Chris Taylor, OF Jabari Blash, RHP Victor Sanchez.
High Desert Mavericks
Class A, California League
City: Adelanto, Calif.
First game: April 4, vs. Inland Empire.
Manager: Eddie Menchaca.
Key players expected to start season with High Desert: 3B DJ Peterson, SS Tyler Smith, OF Gabriel Guerrero, C Tyler Marlette.
Class A, Midwest League
City: Clinton, Iowa.
First game: April 3, at Cedar Rapids.
Manager: Chris Prieto.
Key players expected to start season with Clinton: 3B Jack Reinheimer, 1B Justin Seager, OF Austin Wilson, RHP Lars Huijer.
Class A, Northwest League
First game: June 13, vs. Hillsboro, 7:05 p.m., Everett Memorial Stadium.
Manager: Dave Valle.
Rookie, Appalachian League
City: Pulaski, Va.
First game: June 19, vs. Burlington.
Manager: Rob Mummau.
Rookie, Arizona League
City: Peoria, Ariz.
Manager: Darrin Garner.
Note: The Mariners also have teams in the Dominican and Venezuelan summer leagues.