Holt won his next two fights in New Jersey, before moving down to light welterweight to take on 1996 US Olympian David Díaz on February 4, 2005, at the Foxwoods Casino in Mashantucket, Connecticut. Holt caught Díaz with a whip-like left hook to the head followed by a sharp right hand that dropped him in round one along with opening a cut around his right eye. Diaz finally found the range in the seventh round and floored Holt with two right hands to the head. Holt survived the knockdown and in the next round, stunned Díaz with a blistering five-punch volley of left hooks and right hands to the face. Diaz retreated on wobbly legs; however, Holt continued to unload with both hands and connected with another sharp flurry of shots. The referee had seen enough and stopped the fight, awarding Holt an upset technical knockout victory.