Serena earns high marks in quarterfinal win
When all else fails, there's Serena Williams. Old reliable came through again Tuesday, slugging her way past China's Li Na 7-5, 6-3 hours after big sister Venus suffered the worst loss of her Wimbledon career, thanks to Bulgarian Tsvetana Pironkova. Kim Clijsters crumpled, not for the first time in a major this year, as did Estonian qualifier Kaia Kanepi.
ESPN.com grades the women's quarterfinalists, with Serena unsurprisingly heading the class.
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