In only her 3rd loss of 2015, Serena Williams lost to Roberta Vinci in a semi-final match in the U.S. Open at Arthur Ashe Stadium today.
After losing the first set to Serena 2-6, Vinci rallied to take the next 2 sets 6-4, 6-4.
Vinci lost to Serena in four previous meetings. The shocking loss ended Serena's hopes of winning the elusive Grand Slam of tennis.
Serena previously won 3 Grand Slam titles in 2015: Australian Open, French Open and Wimbledon.
The only tennis player (male or female) to win all 4 Grand Slam titles in a single calendar year was Steffi Graf in 1988.
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