<http://schema.org/keywords>
"Rafael Nadal novak djokovic grigor dimitriov bernard tomic benoit paire men's tennis 2018 andy murray french open ernests gulbis roger federer"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.si.com/tennis/2013/06/04/top-10-mens-tennis-players-2018-ernests-gulbis>