It's happened several times:
New York, Pittsburgh and Baltimore are the only three *cities* to have both won the Superbowl and the World Series in the same year.
Deion Sanders (Super Bowl XXIX, 1992 World Series).
Every team that has ever won the World Series, never won the Super Bowl.
World series masters suck
As of May, 2008 there is only one player that has played in a Super Bowl and a World Series and that is Deion Sanders. Sanders played in Super Bowl XXIX with the 49ers and Super Bowl XXX with the Cowboys and in the 1992 World Series with the Atlanta Braves.
Deion Sanders appeared in the 1992 World Series with the Atlanta Braves. He also played in Super Bowl XXIX with the San Francisco 49ers and Super Bowl XXX with the Dallas Cowboys.
NO
1969 World Series
Pittsburgh. The Pirates won the 1979 World Series and the Steelers won Super Bowl XIV.
Deion Sanders played in the 1992 World Series for the Atlanta Braves and Super Bowl XXIX for the San Francisco 49ers and Super Bowl XXX for the Dallas Cowboys.
Deion Sanders played in Super Bowl XXX for the Dallas Cowboys and the 1992 World Series for the Atlanta Braves.
Super bowl, besides FIFA it is the most watched sporting event
Deion Sanders, who appeared in Super Bowl XXIX with the San Francisco 49ers and Super Bowl XXX with the Dallas Cowboys. He also played in the 1992 World Series as a member of the Atlanta Braves.