petra kvitova of the czech republic has failed in her attempt to defend her title at wimbledon. she was knocked out by four-time tournament champion american serena williams in straight sets.
cri's london correspondent tu yun has more.
prior to tuesday's match, williams won both of their two previous encounters in straight sets. the american extended her winning streak with another clear-cut victory 6-3, 7-5 to book a place in the semi finals.
"i mean it just feels like a good win. she's playing very well. i don't know i if it was more about dethroning or going o
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