The Seattle Mariners are a professional baseball team based in Seattle, Washington. They are a member of the American League West division in Major League Baseball (MLB). Founded in 1977, the Mariners play their home games at T-Mobile Park, a stadium known for its retractable roof and scenic views of the Seattle skyline. The team has a passionate fan base and is recognized for its iconic blue and teal colors. Although the Mariners have yet to win a World Series championship, they have made several playoff appearances and are known for developing talented players, including Hall of Famer Ken Griffey Jr..