 The Tigers started the offseason by trading prospects Jair Jurrjens and Gorkys Hernández to the Atlanta Braves for shortstop Édgar Rentería.Rentería took over the everyday shortstop job with Carlos Guillén moving to first base.Reliever Joel Zumaya underwent surgery on October 31, 2007 for an AC joint reconstruction and was expected to miss half the 2008 season.