Kerber plays Keys in their final group match on Thursday while Halep faces Cibulkova

WTA finals: Kerber crushes Halep, Keys downs Cibulkova

The sixth-seeded Williams was beaten 6-1, 6-7 (2/7), 6-3 by 10th seed Keys, who will now face Anastasia Pavlyuchenkova in the quarter-finals

Madison Keys takes out Venus Williams, advances in Rogers Cup

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WTA finals: Kerber crushes Halep, Keys downs Cibulkova

Madison Keys takes out Venus Williams, advances in Rogers Cup