About: http://webisa.webdatacommons.org/34004942

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	But over the next few years, Djokovic's fortitude and stamina would frequently come into question, and other players - most notably Juan Martin del Potro and Andy Murray - were considered the ones to challenge Federer and Nadal.
http://www.w3.org/ns/prov#wasQuotedFrom	realclearsports.com