Sorana Mihaela Cîrstea (Romanian pronunciation: [soˈrana ˈkɨrste̯a]; born 7 April 1990) is a Romanian professional tennis player. As of 28 May 2012, she is ranked world no. 43. She achieved her career-high ranking of world no. 23 in August 2009, following appearances in the quarterfinals of the French Open and the semifinals of the Los Angeles Open. Cîrstea has been recognized as one of the most beautiful women in sports by MSN.

Cîrstea has a neat, controlled style that minimizes mistakes. According to the Tennis Spy, she does not appear to be fast around the court, but actually is deceptively quick covering the ground with her long strides and good reading of the game. As a good doubles player, she is also a very solid volleyer, and also has solid groundstrokes. Her forehands and backhands are delivered quickly on both sides.

Cîrstea was born to Mihai and Liliana in Bucharest, but currently resides in Târgovişte. She also has a brother, Mihnea, five years her junior. Cîrstea was introduced to tennis at the age of four by her mother. "My mum and dad have always followed tennis and they encouraged me to start playing the sport when I was young. They're the reason I started to play tennis and I guess they are the ones I should thank for getting me into it". She has cited Steffi Graf and Roger Federer as her idols. Cîrstea speaks Romanian, English, Spanish, and French.

Caroline Wozniacki (born 11 July 1990) is a Danish professional tennis player. She is a former world no. 1 on the WTA Tour. As of 23 January 2012, she held this position for 67 weeks. She is the first Scandinavian woman to hold the top ranking position and 20th overall.

Since her WTA debut in 2005, she has improved her year-end ranking each year until finishing on top in both 2010 and 2011. She has won 18 WTA singles titles as of August 2011, three in 2008, three in 2009, six in 2010 (the most since Justine Henin's ten in 2007), and six in 2011. She was runner-up at the 2009 US Open and the 2010 WTA Tour Championships in Doha to Kim Clijsters. She won the 2006 Wimbledon Girls' Singles title but has yet to win a women's Grand Slam title. She also holds two WTA titles in doubles.

Wozniacki is the daughter of Polish Roman Catholicimmigrants, Piotr and Anna Wozniacki. Anna played on the Polish women's national volleyball team, and Piotr played professional football. The couple moved to Denmark when Piotr signed for the Danish football club Boldklubben 1909. Wozniacki's older brother Patrik Wozniacki is a professional footballer for Hvidovre IF in Denmark.

Serena Jameka Williams (born September 26, 1981) is an American professional tennis player and a former world no. 1. The Women's Tennis Association has ranked her world no. 1 in singles on five separate occasions. She became the world no. 1 for the first time on July 8, 2002 and regained this ranking for the fifth time on November 2, 2009. She is the only female player to have won over $35 million in prize money.

Her 27 Grand Slam titles places her ninth on the all-time list: 13 in singles, 12 in women's doubles, and 2 in mixed doubles. She is the most recent player, male or female, to have held all four Grand Slam singles titles simultaneously and only the fifth woman in history to do so. She was also the first woman, along with sister Venus Williams, to hold all four Grand Slam doubles titles simultaneously since Martina Hingis did so in 1998. Her 13 Grand Slam singles titles is sixth on the all-time list. Williams ranks fourth in Grand Slam women's singles titles won during the open era, behind Steffi Graf (22 titles) and Chris Evert and Martina Navratilova (18 titles each). She has won more Major titles in singles, doubles, and mixed doubles than any other active player, male or female.