At Oakland-Alameda County Coliseum, Jason Giambi hits his 400th career home run. The A’s designated hitter goes deep off Dan Harden leading off the fourth inning in an 8-7 loss against Arizona to become the 44th major leaguer to reach the milestone.

On May 23, 2009 — At Oakland-Alameda County Coliseum, Jason Giambi hits his 400th career home run. The A’s designated hitter goes deep off Dan Harden leading off the fourth inning in an 8-7 loss against Arizona to become the 44th major leaguer to reach the milestone.

Sources:
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