Angelique Kerber of Germany battled through her opening match against Dominica Cibulkova of Slovakia. Photo: EPA

Angelique Kerber battles past Dominika Cibulkova in storming opening to WTA Finals in Singapore

German overcomes Slovakian in draining three-setter, while debutant Madison Keys is demolished by Simona Halep

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Angelique Kerber of Germany battled through her opening match against Dominica Cibulkova of Slovakia. Photo: EPA
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