<http://schema.org/keywords>
"nick kyrgios nick kyrgios roger federer serena williams grand slam serena williams calendar slam serena slam judy murray Madison Keys roger federer wimbledon"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/tennis/2015/06/25/daily-bagel-nick-kyrgios-roger-federer>