Ai Sugiyama is a Japanese former tennis player. She reached the world No. 1 ranking in women's doubles on the WTA Tour and had a career-high singles ranking of world No. 8, achieved on February 9, 2004. In her career, she won six singles and 38 doubles titles, including three Grand Slam titles, and one Grand Slam mixed doubles title. Sugiyama held the all-time record, for both male and female players, for her 62 consecutive Grand Slam main-draw appearances, until she was surpassed by Roger Federer at the 2015 Wimbledon Championships.
Cara Black and Liezel Huber were the defending champions, but did not play together. Black partnered with Rennae Stubbs and Huber partnered with Martina Navratilova but both pairs lost to Yan Zi and Zheng Jie, in the semifinals and quarterfinals respectively.
Yan Zi and Zheng Jie were the defending champions but lost in the semifinals to Chan Yung-jan and Chuang Chia-jung
Cara Black and Liezel Huber won the title, defeating Chan Yung-jan and Chuang Chia-jung in the final 6–4, 6–74, 6–1
Lisa Raymond and Samantha Stosur were the defending champions, but lost in the semifinals to Katarina Srebotnik and Ai Sugiyama.
Andy Ram and Vera Zvonareva were the defending champions but Zvonareva did not compete. Ram partnered with Nathalie Dechy but lost in the third round to Marcin Matkowski and Cara Black.
Virginia Ruano Pascual and Paola Suárez were the defending champions, but Suárez did not participate due to injury. Ruano Pascual partnered Conchita Martínez, but lost in the first round to Jennifer Hopkins and Mashona Washington.
Kim Clijsters and Ai Sugiyama were the defending champions, however Clijsters did not compete.
Nadia Petrova and Martina Navratilova were the defending champions, but Navratilova retired from the sport on September 10, 2006, and only Petrova competed that year.
Petrova partnered with Svetlana Kuznetsova, but lost in the quarterfinals to Nathalie Dechy and Sun Tiantian.
The 2007 US Open women's doubles tennis tournament was held from 27 August to 9 September 2007, at USTA Billie Jean King National Tennis Center at Flushing Meadows, New York City. The event was won by first-time pairings Nathalie Dechy and Dinara Safina.
Alicia Molik and Mara Santangelo were the defending champions, but lost in the first round to Sara Errani and Bethanie Mattek.
Květa Peschke and Francesca Schiavone were the defending champions. They were both present but did not compete together.
Peschke partnered with Janette Husárová, but lost in the quarterfinals to Daniela Hantuchová and Ai Sugiyama.
Schiavone partnered with Katarina Srebotnik, but lost in the semifinals to Svetlana Kuznetsova and Alicia Molik.
Cara Black and Liezel Huber were the defending champions, but lost in the quarterfinals to sisters Alona Bondarenko and Kateryna Bondarenko.
Lisa Raymond and Samantha Stosur were the defending champions, but Stosur chose not to participate, and only Raymond competed that year.
Raymond partnered with Elena Likhovtseva, but lost in the quarterfinals to Květa Peschke and Rennae Stubbs.
Nathalie Dechy and Mara Santangelo were the defending champions, but Dechy chose not to participate, and only Santangelo competed that year.
Santangelo partnered with Alicia Molik, but lost in the second round to Maria Kirilenko and Agnieszka Radwańska.
Serena and Venus Williams defeated Lisa Raymond and Samantha Stosur in the final, 6–2, 6–2 to win the ladies' doubles tennis title at the 2008 Wimbledon Championships. They won the title without dropping a set. The Williams sisters played against each other in the singles final as well, in which Venus emerged victorious.
Jamie Murray and Jelena Janković were the defending champions but Janković did not participate. Murray partnered with Liezel Huber but lost in the semifinals to Bob Bryan and Samantha Stosur.
Defending champions Serena and Venus Williams defeated Samantha Stosur and Rennae Stubbs in the final, 7–6(7–4), 6–4 to win the ladies' doubles tennis title at the 2009 Wimbledon Championships. As in the previous year, the Williams sisters won the title without losing a set during the tournament.
Yan Zi and Zheng Jie were the defending champions, but retired due to Zheng's left ankle injury in the second round.
Daniela Hantuchová and Ai Sugiyama were the defending champions but decided not to defend the title together. Hantuchová chose to play with Nadia Petrova while Sugiyama played with Katarina Srebotnik. Both lost in the second round. Nathalie Dechy and Mara Santangelo won the title by defeating Tathiana Garbin and Roberta Vinci 6–4, 6–1 in the final.
The doubles Tournament at the 2007 Generali Ladies Linz took place between 22 and 28 October on the indoor hard courts of the TipsArena Linz in Linz, Austria. Cara Black and Liezel Huber won the title, defeating Katarina Srebotnik and Ai Sugiyama in the final.
Cara Black 
Liezel Huber 
Katarina Srebotnik 
Ai Sugiyama 
