Sloane Stephens, John Isner rep U.S.
PERTH, Australia -- Sloane Stephens will join former champion John Isner on the U.S. team for the 2014 Hopman Cup, the annual international mixed-team tennis tournament.
The 20-year-old Stephens, who upset Serena Williams in the Australian Open quarterfinals to start 2013, has improved 26 places in the rankings to No. 12 this year.
Isner won the 2011 Hopman Cup with Bethanie Mattek-Sands and combined with Venus Williams for the 2013 edition.
Petra Kvitova, the 2011 Wimbledon ...
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