The Seattle Mariners are an American professional baseball team based in Seattle, Washington. The Mariners compete in Major League Baseball (MLB) as a member club of the American League (AL) West division. The team joined the AL as an expansion team in 1977. Since July 1999, the Mariners' home ballpark has been Safeco Field, located in the SoDo neighborhood of Seattle. SoDo means "South of Downtown."
Safeco Field (sometimes referred to as just Safeco) is a retractable roof baseball stadium located in Seattle, Washington. Owned and operated by the Washington State Major League Baseball Stadium Public Facilities District, it is the home stadium of the Seattle Mariners of Major League Baseball (MLB) and has a seating capacity of 47,943 for baseball. It is located in Seattle's SoDo neighborhood, near the western terminus of Interstate 90. The first game was played on July 15, 1999.