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 "Amir Khan (boxer)"): Additionally he held the Commonwealth lightweight title from 2007 to 2008, the WBC Silver welterweight title from 2014 to 2016, and has challenged once for a middleweight world title in 2016.
Relevant evidence: No