Radwanska will look to defend her season-ending title at Singapore.
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With the top-three players in the world fairly secure, the most competitive battle at season's end could be for World no. 4.
Anastasija Sevastova faces Caroline Wozniacki in the US Open quarterfinals on Tuesday
Ivo Karlovic, Marat Safin and Justine Henin made headlines in Newport.
Juan Martin del Potro upset Stan Wawrinka in the ATP draw at Wimbledon but must rally against Lucas Pouille.
Former Wimbledon quarterfinalist Philipp Kohlschreiber has shone at recent ATP tournaments.
The two most successful tennis players at the French Open and other clay events have been Rafael Nadal and Bjorn Borg.
The ATP might benefit from bringing grass-court tennis to New York after Wimbledon.
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