2 cities, both Chicago and LA had both of their MLB teams in the playoffs
Chicago: The Red Sox and Cubs
Los Angeles: Angels and Dodgers
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Andy Pettitte has the most career postseason wins with 18.
As of 2012's Postseason, 10 teams in total, 5 teams from each league will make the Postseason.
Derek Jeter holds the record for most career games played in the postseason with 138.
In Major League Baseball, a wild card may be issued if two teams in both the American and the National league qualify for the postseason even though they did not win in their division.
There are 2 Wildcards in Major League Baseball, one in each league. The wildcard team -- the team with the best record that did not win the division -- gets to join the division winners in the postseason.
Major League baseball season typically runs from early April to late September, followed by the postseason in October.
Through game 1 of the 2010 playoffs, Derek Jeterhas made the most postseason appearances. He has played in 139 games.