Andrea Petkovic (Serbian: Андреа Петковић, Andrea Petković; born 9 September 1987) is a German professional tennis player from Griesheim, near Darmstadt in Germany.

Petkovic reached her career-high singles ranking of world no. 9 on 10 October 2011. She has won 2 WTA titles, 8 ITF singles titles and 3 ITF doubles titles. Petkovic became the German national champion in 2007 and 2009. She is coached by Petar Popović and her father Zoran.

Andrea Petkovic was born in Tuzla, SR Bosnia and Herzegovina, SFR Yugoslavia. but at the age of six months, the family relocated to Germany. Petkovic first took to the tennis courts when she was six; her father Zoran Petkovic, former Yugoslav tennis player and member of the Yugoslavia Davis Cup team, was a coach at a club in Darmstadt at the time. He introduced her to the sport and later became her coach. She was able to finish high school before competing in tennis full-time because Zoran never influenced her into joining the professional circuit.

Apart from tennis, she likes to educate herself by reading; her favourite authors are Goethe and Wilde. Her mother Amira is a dental assistant while her younger sister Anja is a student. Petkovic graduated from high school in 2006 with an Abitur from the Georg-Büchner-Schule in Darmstadt, a Gymnasium. She has been studying Political science at the FernUniversität Hagen since 2008.

Samantha "Sam" Jane Stosur (English pronunciation: /ˈstoʊzər/ STOH-zər, born 30 March 1984) is an Australian professional tennis player. She won the 2011 US Open singles title and was a finalist at the 2010 French Open. Stosur is ranked World No. 6 and her career high in singles is World No. 4, achieved on 21 February 2011. She is a former world No. 1 on the WTA Tour in doubles with Lisa Raymond from the United States.

Stosur was born in Brisbane, Queensland, the daughter of Tony and Diane, and has two brothers, Dominic and Daniel. She is of Polish descent through her grandfather. When she was six, the family house and business on the Gold Coast was destroyed by a flood, and the family moved to Adelaide. There she started playing tennis, when she was given a racquet for Christmas at the age of eight. While her parents worked long hours at the cafe they had started, Stosur played at local courts with older brother Daniel, who later encouraged their parents to take her to tennis lessons. Stosur attended Helensvale State High School on the Northern Gold Coast. She went away on her first overseas trip at the age of 13, competing in the World Youth Cup in Jakarta, Indonesia.

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.