<http://schema.org/mainEntityOfPage>
<http://www.upi.com/Sports_News/2013/10/04/Serena-Williams-heads-into-China-Open-semifinals/81931380894762/>
<http://www.upi.com/Sports_News/2013/10/04/Serena-Williams-heads-into-China-Open-semifinals/UPI-81931380894762/?spt=mps&or=5>