WTA Finals: Dominika Cibulkova upsets Angelique Kerber in Singapore
The world-beating season few had predicted for Angelique Kerber has fallen one match short of ending on the same type of high note as it began, with the top seed upstaged 6-3, 6-4 in the WTA Finals by an opponent, Dominika Cibulkova, now celebrating her own belated career peak.