(This article is about the 2012 Major League Baseball season only. For information on all of baseball, see 2012 in baseball.) The 2012 Major League Baseball season began on March 28 with the first of a two-game series between the Seattle Mariners and the Oakland Athletics at the Tokyo Dome in Japan. On November 22, 2011, a new contract between Major League Baseball and its players union was ratified, and as a result, an expanded playoff format adding two clubs will be adopted no later than 2013 according to the new Collective Bargaining Agreement. The new format was finalized for the 2012 season on March 2, 2012, and will use the 2–3 game schedule format for the Division Series for the 2012 season only. The restriction against divisional rivals playing against each other in the Division Se