The 2009 China Open – Women's Singles was the women's singles event of the China Open, a WTA Premier Mandatory tennis tournament held in October in Beijing.
 Jelena Janković was the defending champion, but lost in the second round against Peng Shuai.
Peng Shuai and Zhang Shuai were the defending champions, however Peng chose not to participate.
 Zhang partnered with Chuang Chia-jung, but lost in the first round to Anastasia Rodionova and Vera Zvonareva.
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Mary Pierce (born 15 January 1975) is a French retired tennis professional who played on the Women's Tennis Association (WTA) tour.
 Born in Canada, she is a citizen of Canada, and the United States.
 Pierce played for France in team competitions and in the Olympics.
Yuan Meng (born 9 May 1986) () is a former Chinese female professional tennis player.
 She is China's fifth-highest ranked women's singles player after Zheng Jie, Li Na, Peng Shuai, and Yan Zi.
 Yuan has won four ITF singles titles and one ITF doubles title.
Andrea Hlaváčková and Peng Shuai were the defending champions, but Peng could not participate due to injury.
 Hlaváčková played alongside Lucie Hradecká, but lost in the quarterfinals to Casey Dellacqua and Yaroslava Shvedova.
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Hsieh Su-wei and Peng Shuai were the defending champions, but Peng chose not to participate this year.
 Hsieh played alongside Flavia Pennetta, but lost in the quarterfinals to Andrea Hlaváčková and Lucie Hradecká.
Hsieh Su-wei and Peng Shuai were the defending champions, but Peng decided not to compete this year.
 Hsieh played alongside Sania Mirza, but lost in the final to Raquel Kops-Jones and Abigail Spears, 4–6, 4–6.
Hsieh Su-wei and Peng Shuai were the defending champions, but Peng withdrew from the tournament with a back injury.
 Hsieh played alongside Flavia Pennetta, but lost in the first round to Klaudia Jans-Ignacik and Andreja Klepač.
Peng Shuai (; ; born 8 January 1986) is a Chinese professional female tennis player.
 She reached a career high ranking of World No. 1 in doubles by the Women's Tennis Association on 17 February 2014, making her the first Chinese professional tennis player (male or female, and in singles or doubles) to reach World No. 1.
 She won a gold medal at the 2010 Asian Games, defeating Akgul Amanmuradova in the final.
 At the 2013 Wimbledon Championships, Peng won her first ladies' double championship with Hsieh Su-wei of Taiwan and again won at the 2014 French Open with Hsieh.
Andrea Hlaváčková and Peng Shuai were the defending champions, but Peng chose not to participate and Hlaváčková chose to compete in s'Hertogenbosch instead.

Question: Are Mary Pierce and Peng Shuai both retired tennis players?
Answer: no