Jason Giambi retires: A look back at his Athletics career
Giambi's Homer in 13th Cures All for Yanks - The New York Times
Jason Giambi Retires - MLB Trade Rumors
Ex-Athletics star Jason Giambi announces retirement
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Jason Giambi retires after 20 seasons in majors, Pro
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What Happened to Jason Giambi and Where is He Now? - FanBuzz
Jason Giambi retiring after 20 MLB seasons