MINT SPORTS Jason Giambi ROOKIE GEM 10. Great rookie card at the highest grade. This is Jason's draft card from when he was going from MiLB to MLB. There aren't many of these cards graded as a 10. Pretty rare Jason Gianni rookie baseball card. In the MLB Jason was a first baseman and designated hitter for Oakland Athletics, New York Yankees, Colorado Rockies and Cleveland Indians. He has a batting average of .277, is a 5x all-star, received the silver slugger award 2x, AL MVP in 2000 and AL comeback player of the year in 2005. Giambi also won a bronze medal in the 1991 pan American games for the Havana team, representing the United States. Please refer to photos thank you. Jason Giambi mint card sold as is.