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Hambletonian 10, or Rysdyk's Hambletonian, (May 5, 1849 – March 27, 1876) was an American trotter and a founding sire of the Standardbred horse breed. The stallion was born in Sugar Loaf, New York, on 5 May 1849. Hambletonian has been inducted into the Immortals category of the Harness Racing Hall of Fame.