Question: What is the nickname of the Argentinian tennis player who once lost to Janko Tipsarević?
Sentence (from "Janko Tipsarević"): He also has thirteen victories against other players in the top 10: four wins against Tomáš Berdych, and one each against Fernando González, Mikhail Youzhny, David Ferrer, James Blake, Gaël Monfils, Andy Murray and Juan Mónaco.
Relevant evidence: Yes