The 2009 ATP Salzburg Indoors was a professional tennis tournament played on indoor hard courts. It was the first edition of the tournament and was part of the 2009 ATP Challenger Tour. It took place in Salzburg, Austria between 30 November and 6 December 2009.
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.
The 2011 Beijing International Challenger 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 and the 2011 ITF Women's Circuit. It took place in Beijing, China between 1 and 7 August 2011.
The 2012 Internationaux de Nouvelle-Calédonie was a professional tennis tournament played on hard courts. It was the ninth edition of the tournament which is part of the 2012 ATP Challenger Tour. It took place in Nouméa, New Caledonia between 2 and 8 January 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.
The 2012 All Japan Indoor Tennis Championships was a professional tennis tournament played on clay courts. It was the 16th edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Kyoto, Japan between 5 and 11 June March.
Gianluigi Quinzi, is a former tennis player from Italy. On 15 April 2019 he reached his career-high singles ranking of World No. 142 on the ATP World Tour rankings. He reached his career high ranking of No. 1 in ITF Juniors rankings on 1 January 2013.
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 2012 Ningbo 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 and the 2012 ITF Women's Circuit. It took place in Ningbo, China, on 10–16 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.
The 2014 ATP Challenger Guangzhou was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2014 ATP Challenger Tour. It took place in Guangzhou, China between 24 February and 2 March 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.
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.
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 
