Opening Day saw Mariners win 3:1 against the A's in Japan, with Ackley getting the first HR of the season.
The stateside portion of the regular season will start April 4 in Miami, Florida, with the opening of the new Marlins Park, as the newly renamed Miami Marlins host the defending World Series champion St. Louis Cardinals. The season is scheduled to end on Wednesday, October 3.
The Major League Baseball postseason was expanded to include a second wild card team in each league beginning in the 2012 season. The season will mark the last for the Houston Astros as a member of the National League. Following the sale to new owner Jim Crane, the Astros agreed to move to the American League effective in the 2013 season, and will be assigned to the American League West, joining their in-state rivals, the Texas Rangers.