Jason Giambi is one of baseball's big boppers. Giambi played for the Oakland A's from 1995-2001 and joined the New York Yankees in 2002 and has crushed 355-plus home runs so far in his career. Along the way he has been a five-time All-Star won AL MVP honors in 2000 and was the 2005 AL Comeback Player of the Year. Jason Giambi has hand signed this official MLB baseball which comes complete with an Authentic Memorabilia Certificate of Authenticity.