Sports - Tennis
Poland's Radwanska wins Helep 2-0 at WTA tennis tournament
Kvitova beats Safarova 2-0 at WTA Finals
Kerber wins Kvitova 2-0 at WTA Finals
WTA finals: Muguruza beats Safarova 2-0
Li Na attends WTA Finals press conference in Singapore
Djokovic claims title of men's singles at Shanghai Masters
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