Tennis superstar Serena Williams lost her bid to add the rare achievement of a calendar grand slam to her already impressive list of career achievements -- losing in the semifinals of the U.S. Open to unseeded Roberta Vinci in a tough third set at the U.S. Open in New York City, September 11, 2015. Only five singles players in tennis history have achieved the Grand Slam -- Maureen Connolly, Don Budge, Rod Laver, Margaret Court and Steffi Graff.
Williams is considered by many to be the best female tennis player of all time. She holds the most major singles, doubles and mixed doubles titles of all active players. With a total of 21 Grand Slam titles, she ranks third on the all-time list behind Margaret Court (24) and Steffi Graff (22).
Here, Williams reacts after losing a point to Roberta Vinci, of Italy, during their semifinal match.