Serena Williams makes a forehand return during her second round loss to compatriot Madison Brengle. Photo: AP

Erratic Serena Williams stunned by fellow American Madison Brengle at Auckland Classic

Top seed pays price for 88 unforced errors as opponent posts biggest win of career with 6-4 6-7(7-3) 6-4 second round victory

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Serena Williams makes a forehand return during her second round loss to compatriot Madison Brengle. Photo: AP
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