Question: What is the nationality of this professional boxer who lost to Breidis Prescott in a upset match in 2008 that was heavily favoured toward him?
Sentence (from "Breidis Prescott"): In 2008, Prescott first became known on the world stage when he upset heavily favoured and then-undefeated Olympian Amir Khan, which gave rise to Prescott's nickname of "The Khanqueror".
Relevant evidence: Yes