About: http://webisa.webdatacommons.org/11899138

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	Sure, he has improved his serve and learned how to slice and volley, but they serve mostly to supplement his main strength: his defense.
http://www.w3.org/ns/prov#wasQuotedFrom	tennis-x.com