It’s not the least bit surprising to see horses like Giant’s Causeway,
A.P. Indy and Unbridled’s Song among the leading sires of American
Graded Stakes winners, a weekly feature brought to you by Keeneland.
After all, Giant’s Causeway leads all American-based sires by progeny
earnings in 2009, A.P. Indy is fifth on the list and Unbridled’s Song
ninth, according to bloodhorse.com.
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