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Serena Williams loses at US Open, misses Grand Slam

U.S. tennis star Serena Williams lost the semifinal round at the U.S. Open Friday afternoon. She was upset by Roberta Vinci of Italy.

Williams was chasing a calendar Grand Slam, which hasn't been done since 1988, when Steffi Graf did it. Vinci won the match in three sets 2-6, 6-4, 6-4.

Williams—who was coming off a hard-fought victory in a three set match with her sister, Venus Williams—left the court quickly after the loss.

The defeat may have stung, but Serena Williams remains one of the wealthiest tennis players in the world.