Serena Williams joined her sister Venus in the Wimbledon quarter-finals and the pair remain on course for what would be their fourth meeting in the final.

Serena won easily, 6-3 6-1 against Slovakian Daniela Hantuchova who was outclassed from midway through the first set, when the second seed raised her level of performance.

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Her next opponent will be Victoria Azarenka, the eighth seed from Belarus who knocked out 10th seed Nadia Petrova in three sets.

Azarenka prevailed 7-6 (7-5) 2-6 6-3 against the Russian.

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Unseeded Italian Francesca Schiavone produced a shock victory to extend her impressive run, beating French 26th seed Virginie Razzano 6-2 7-6 (7/1).

Schiavone had not previously gone beyond the third round at Wimbledon, and will face Dementieva next.