Nenad Zimonjić and Samantha Stosur were the defending champions, but Stosur chose not to participate this year.
 Zimonjić played alongside Jarmila Gajdošová, but lost in the third round to Robert Lindstedt and Anabel Medina Garrigues.
Tathiana Garbin (born 30 June 1977) is an Italian retired tennis player.
 Garbin is probably best known for her surprise defeat of the defending champion and the reigning World No. 1 Justine Henin in the second round of the 2004 French Open.
 The winner of one singles and eleven doubles WTA Tour titles, she reached her highest singles ranking World No. 22 on 21 May 2007, and her highest doubles ranking World No. 25 on 27 August 2001.
 Other high–ranked players she defeated include Jelena Dokić, Chanda Rubin, Flavia Pennetta, Agnieszka Radwańska, Nadia Petrova, Marion Bartoli and Samantha Stosur.
Lisa Raymond and Samantha Stosur were the defending champions, but withdrew due to a viral illness for Stosur, before their quarterfinal against Jarmila Gajdošová and Akiko Morigami.
Lisa Raymond and Samantha Stosur were the defending champions, but Stosur chose not to participate, and only Raymond competed that year.
Lisa Raymond and Samantha Stosur were the defending champions, but Stosur chose not to participate, and only Raymond competed that year.
This is a list of the main career statistics of professional Australian tennis player, Samantha Stosur.
 To date, Stosur has won eight WTA singles titles including one Grand Slam singles title at the 2011 US Open.
 She was also the runner-up at the 2010 French Open and a semi-finalist at the 2010 and 2011 WTA Tour Championships.
 Stosur has also enjoyed a successful doubles career, in which she has held the World No. 1 ranking and won twenty-four WTA doubles titles including two grand slam women's doubles titles at the 2005 US Open and 2006 French Open and two year-ending championships at the 2005 and 2006 WTA Tour Championships.
Robert Charles Bryan (born April 29, 1978) is an American male professional tennis player.
 He has won twenty-three Grand Slam titles: 16 in men's doubles and 7 in mixed doubles.
 He turned professional in 1998.
 With his twin brother Mike, he has been world No. 1 doubles player for much of the last several years, first achieving the top ranking in September 2003.
 The brothers were named ATP Team of the Decade for 2000–2009.
 The brothers became the second men's doubles team to complete the career golden slam at the 2012 Summer Olympics.
Bob Bryan and Samantha Stosur were the defending champions, but lost in the quarterfinals to Mark Knowles and Anna-Lena Grönefeld.
Samantha Jane "Sam" Stosur ( ; born 30 March 1984) is an Australian professional tennis player.
 She is a former world No. 1 in doubles, a ranking which she held for 61 weeks, and a former world No. 4 in singles.
Gisela Dulko (] ; born 30 January 1985, in Tigre) is a retired professional tennis player from Argentina.
 Although she enjoyed modest success in singles, reaching world no. 26 and winning four WTA Tour titles, her speciality was doubles, where she achieved a world no. 1 ranking.
 Partnering with Flavia Pennetta, Dulko won the 2010 WTA Tour Championships and the 2011 Australian Open in doubles.
 Dulko also reached the mixed doubles final at the 2011 US Open, with Edward Schwank.
 She is remembered for her ability to upset the big names on the tour, such as Maria Sharapova in the second round of Wimbledon in 2009; and Samantha Stosur in the third round of Roland Garros in 2011.
 She also beat Martina Navratilova in the second round of Wimbledon in 2004 in Navratilova's final Grand Slam singles match.

Question: have Bob Bryan and Samantha Stosur both been world No. 1 in doubles?
Answer: yes