Auckland: American tennis sisters Serena and Venus Williams were beaten but Danish Caroline Wozniacki advanced to the quarter-finals of the Auckland Classic tennis tournament on Wednesday.

Serena, 35, failed to defeat Madison Brengle, who won 6-4, 6-7 (3-7), 6-4, reports Efe.

Venus withdrew from her match against Naomi Osaka of Japan after she sustained an injury to her arm.

Also reads: kova 3-6, 6-4, 5-7 aSecond-seed Halep halted by Siniat WTA Shenzhen Open

Denmark's Caroline Wozniacki continued her campaign and managed to defeat the American Varvara Lepchenko 6-3, 6-3.

She will play against Julia Goerges of Germany, who defeated Britain's Naomi Broady 7-5, 6-4.