About: http://webisa.webdatacommons.org/308308054

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	Of course tennis has changed over time, especially on clay, the same level of specialists are not around, this is obvious enough and Federer has benefited from this, just like Graf benefited when Seles got stabbed.
http://www.w3.org/ns/prov#wasQuotedFrom	menstennisforums.com