Venus Williams of USA is the latest upset victim in Olympic tennis, losing to Li Na of China in the quarterfinals.Double Olympic champion Venus Williams was beaten 7-5, 7-5 by China's Li Na in the quarter-final of the women's singles on Thursday.
Shortly after her sister Serena had been knocked out by Elena Dementieva, American Venus, the seventh seed, came up against an inspired home favorite.
Williams remained in the doubles competition and was to play with her sister in the quarterfinals later Thursday.
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