Serena Williams of the United States reacts while taking on Elena Dementieva of Russia in the women's tennis quarterfinals at the Olympic Green Tennis Centre during Day 6 of the Beijing Olympic Games on Thursday.
Dementieva defeated Serena Williams 3-6, 6-4, 6-3.
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Williams, playing in her first Olympic singles tournament here despite winning doubles gold in Sydney, appeared on course for victory when she powered through the opening set but her challenge evaporated.
Gold, patriotism spur on champs
Dementieva, a singles silver medal winner at the Sydney Olympics, gradually came to terms with her opponent as she found her range with her precision baseline game.
Dementieva now faces an all-Russian semi-final with Vera Zvonareva who beat Austria's Sybille Bammer 6-3 3-6 6-3.