Adam Greenberg is getting the most unlikely of second chances.  More than seven years after he was beaned in the head by the first and only pitch he saw in the majors, Greenberg will make another plate appearance tonight for the Miami Marlins.  The Marlins received permission from Major League Baseball Commissioner Bud Selig [[ SEE-lig ]] and offered the now 31-year-old outfielder a one-day contract.  As a member of the Chicago Cubs, Greenberg was hit by Marlins pitcher Valerio De Los Santos in July 2005.  It caused headaches, dizziness and double vision and essentially ended his big league career.  Now he'll get one more chance at a major league moment.