The 2008 SAP Open doubles was a men's tennis tournament played on indoor hard courts in San Jose, California in the United States.
Wesley Moodie and Todd Perry were the defending champions, but chose not to participate that year.
The 2011 Singapore ATP Challenger was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2011 ATP Challenger Tour. It took place in Singapore between 24 and 30 January 2011.
The 2011 ATP Challenger Guangzhou was a professional tennis tournament played on hard courts. It was the second edition of the tournament which was part of the 2011 ATP Challenger Tour. It took place in Guangzhou, China between 14 and 20 March 2011.
Robin Söderling was the defending champion but could not defend his title because of a bout of mononucleosis.
Roger Federer won the title beating Juan Martín del Potro 6–1, 6–4 in the final.
The 2012 Singapore ATP Challenger was a professional tennis tournament played on hard courts. It was the second edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Singapore between February 27 and March 4, 2012.
The 2012 Singapore ATP Challenger was a professional tennis tournament played on hard courts. It was the second edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Singapore between February 27 and March 4, 2012.
Sanchai Ratiwatana and Sonchat Ratiwatana won the first edition of the tournament 4–6, 7–6(7–1), [13–11] against Ruan Roelofse and Kittipong Wachiramanowong
Michaël Llodra and Nenad Zimonjić were the defending champions, but Llodra chose not to compete this year.
Zimonjić played alongside Paul Hanley, but they lost to Bob and Mike Bryan in the quarterfinals, who won the tournament in the end against Marcel Granollers and Marc López 6–1, 4–6, [12–10].
The 2012 Shanghai Challenger was a professional tennis tournament played on hard courts. It was the second edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Shanghai, China between 3 and 9 September 2012.
The 2014 ONGC–GAIL Delhi Open was a professional tennis tournament played on outdoor hard courts. It is the first edition of the tournament for the men and for the women. It was part of the 2014 ATP Challenger Tour and the 2014 ITF Women's Circuit, offering a total of $100,000 in prize money in the men's event and $25,000 in the women's event. It took place in New Delhi, India, on 17–23 February 2014.
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions, but decided to compete at the ATP Challenger Guangzhou instead.
Henri Kontinen and Konstantin Kravchuk won the title, defeating Pierre-Hugues Herbert and Albano Olivetti in the final, 6–4, 6–7(3–7), [10–7].
Brendan Evans and Ryan Sweeting were the defending champions, but Sweeting did not compete this year. Evans teamed up with Jamie Baker and lost in quarterfinals to tournament winners Alessandro Da Col and Andrea Stoppini.
Rik de Voest and Ashley Fisher were the defending champions, but lost in the final 6–4, 7–6(7–3) to tournament winners Eric Butorac and Travis Parrott.
Hsieh Cheng-peng and Yang Tsung-hua were the defending champions but lost in the semifinals to Sanchai and Sonchat Ratiwatana.
The 2018 Keio Challenger was a professional tennis tournament played on hard courts. It was the thirteenth (ATP) and second (ITF) editions of the tournament and part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Yokohama, Japan between 26 February and 4 March 2018 for the men's edition and between 5 and 11 March 2018 for the women's.
Marco Chiudinelli and Franko Škugor were the defending champions but chose not to defend their title.
In the 2018 Seoul Open Challenger Doubles tennis tournament, Hsieh Cheng-peng and Peng Hsien-yin were the defending champions but chose to defend their title with different partners. Hsieh partnered Christopher Rungkat but lost in the quarterfinals to Toshihide Matsui and Frederik Nielsen. Peng partnered Aliaksandr Bury but lost in the semifinals to Chen Ti and Yi Chu-huan.
Jeremy Beale and Marc Polmans were the defending champions but only Polmans chose to defend his title, partnering Evan King. Polmans lost in the first round to Marcelo Tomás Barrios Vera and Alejandro Tabilo.
This was the second of two editions of the tournament in the 2021 tennis season. Mackenzie McDonald was the defending champion but lost in the second round to Tomáš Macháč.
Kamil Čapkovič 
Amir Weintraub 
Hsieh Cheng-peng 
