The Oakland Athletics, defending champions of the American League West, open against the Seattle Mariners.

WSJ: On This Opening Day, It's All About the West

They're moving from the National League Central, a relatively weak division, to the American League West, one of baseball's toughest.

WSJ: The Houston Astros School of Economics

Can you imagine the Houston Astros deciding on their own to move from the National League Central to the American League West to join the Texas Rangers?

FORBES: NCAA Should Have A Say In Conference Realignment

After a brief stint in the American League West (1970-1971), the Brewers had called the American League East home for 22 years (1972-1993) before a temporary relocation to the American League Central (1994-1997).

FORBES: Great Expectations In The Brew City

The club is off 13% at the gate this season, over 3, 200 fans a game, despite a respectable 39-40 record that has it just two games off the lead in the American League West.

FORBES: Baseball Still Not Growing the Gate