Through the 2008 season, both the Dodgers and Giants have lost 12 World Series.
The San Diego Padres lost the 1984 World Series to the Detroit Tigers 4 games to 1.
Giants
The Texas Rangers lost the las two World Series. This year, 2011, they lost to the St. Louis Cardinals. Last year, 2010, they lost to the San Francisco Giants.
Mets
the Yankees
It has never happened in World Series history.
The Texas Rangers lost the 2010 World Series in five games to the San Francisco Giants. A year later, they lost the 2011 World Series in seven games to the St. Louis Cardinals.
As of the 2008 season, the New York Yankees have lost the most World Series with 13. They have also won the most World Series at 26.
Toronto ,Tampa Bay, Houston
The St. Louis Cardinals lost to the Philadelphia Athletics in the 1930 World Series.
The Tampa Bay Rays lost to the Philadelphia Phillies in the 2008 World Series.