No they have not.
No. The Mariners have never won the AL and advanced to the World Series.
No. They went to the World Series in 2008 and lost to Philadelphia Phillies. That was their only World Series appearance.
The Mariners have never won the world series.
They have never won a World Series title.
The Mariners have never even been to the World Series.
There are actually 3 teams that have never made it to the World Series. They are the Seattle Mariners, the Texas Rangers, and the Washington Nationals.
The Seattle Mariners and Washington Nationals have both never been to the World Series, so they have none. In addition, the Rockies, Rangers, Padres, Brewers, Rays, Astros have never won a World Series
Teams that have never won a World Series: Colorado Rockies, Houston Astros, Milwaukee Brewers, Tampa Bay Rays, Seattle Mariners, Texas Rangers, Washington Nationals.
The Washington Nationals and the Seattle Mariners are the only two active MLB teams that have never been in the World Series.
Texas Rangers, Seattle Mariners, Colorado Rockies, San Diego Padres, Wasington Nationals, Houston Astros
In the MLB, Washington Nationals, Seattle Mariners, and Texas Rangers.
There are at least a minimum of eight teams in Major League Baseball who have not won the World Series and they are the Texas Rangers, the Seattle Mariners and Tampa Bay Rays of the America League, the Houston Astros never won the World Series as part of either the American or National League, the Colorado Rockies, Milwaukee Brewers and San Padres of the National League and also the National League's Washington Nationals who had also never won it as the Montreal Expos.