The 14th seed slumped to a shock 4-2 defeat against world number 105 Hamilton, who now plays fellow qualifier Josephus Schenk.

BBC: SPORT | Other Sport | Darts | Taylor and Lloyd into last eight

But their compatriot Flavia Pennetta made a shock early exit as the 19th seed lost 6-3 1-6 6-2 against Russian qualifier Nina Bratchikova.

CNN: No. 1 Wozniacki wins Melbourne opener

In other matches, top seed Maria Sharapova suffered a shock 6-2 7-5 defeat by Hungarian veteran Greta Arn.

BBC: Heather Watson loses to Shuai Peng in Auckland quarters