Quarters augur another all-Williams final
Serena and Venus Williams remain on course for a third straight meeting in a Wimbledon final. The sisters advanced in similar fashion Monday, beating hard-hitting opponents in two tight sets.
Serena continues her march Tuesday against China's Li Na in the pick of the quarterfinals, while Venus meets Bulgarian upstart Tsvetana Pironkova. Pironkova and Petra Kvitova make their Grand Slam quarterfinal debuts.
Serena Williams (1) versus Li Na (9)
Li is in good ...
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