2009 Major League Baseball season

The American League champion had home field advantage for the World Series by virtue of winning the All-Star Game on July 14 at Busch Stadium in St. Louis, Missouri, 4–3.

The Seattle Mariners named Milwaukee Brewers scouting director Jack Zduriencik its new general manager on October 22, replacing interim GM Lee Pelekoudas.

Washington Nationals GM Jim Bowden resigned on March 1 amid allegations that he was skimming bonus money from Latin American players.

The following day, the San Diego Padres axed Kevin Towers, who had been the longest-tenured GM in Major League Baseball at 14 seasons.

On January 15, the owners of the 30 Major League Baseball clubs approved two rule changes governing the playing of postseason and one-game playoff games.

In late March, the Florida Marlins had their funding for a new stadium at the former site of the Miami Orange Bowl approved by Miami-Dade County commissioners.

The national telecast breakdown, along with the maximum number of appearances per team, is: In Canada, Toronto Blue Jays games will be televised on Rogers Sportsnet and TSN.

Other teams' memorials and accomplishments on their sleeves: The Pittsburgh Pirates, Detroit Tigers, Oakland Athletics and Chicago White Sox led the Majors in wearing throwback uniforms.

[37] On June 14, the Tigers and Pirates wore throwback uniforms to commemorate the 100th anniversary of both Forbes Field and the 1909 World Series between the two teams.

That game also featured a throwback atmosphere: no music or flashy graphics, no mascots (meaning no Jolly Roger or Pirate Parrot), and a hand-operated scoreboard.

One modern item occurred in the pre-game: The Stanley Cup champion Pittsburgh Penguins made a surprise visit and brought the trophy with them.

In addition to the aforementioned Civil Rights Game and game in Oakland, the White Sox, originators of the genre of replica throwback uniforms, commemorated the fiftieth anniversary of their 1959 American League Championship on June 25 against the team that they played in that World Series, the Los Angeles Dodgers, who opted to wear their regular uniforms instead, as manager Joe Torre did not want to create hype of a World Series that was 50 years ago.