Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions, but they lost in the final 3-6, 4-6 against Jonathan Marray and Jamie Murray.
The 2009 SAT Khorat Open was a professional tennis tournament played on outdoor hard courts. It was part of the 2009 ATP Challenger Tour. It took place in Khorat, Thailand between 23 and 29 March 2009.
Colin Fleming and Ken Skupski were the defending champions; however, they didn't start this year.
Unseeded Frederik Nielsen and Joseph Sirianni won in the final 4–6, 6–4, [10–6], against 1st-seeded Sanchai Ratiwatana and Sonchat Ratiwatana.
Sonchat Ratiwatana and Sanchai Ratiwatana were the defending champions of the Men's Doubles competition of the 2011 SEA Games but lost to Do Minh Quan and Ngo Huang Huy in the quarterfinals. Christopher Rungkat and Elbert Sie won the title by beating Treat Conrad Huey and Cecil Mamiit 2–6, 6–2, [10–7] in the final.
Tamarine Tanasugarn and Sonchat Ratiwatana are the defending champions of the Mixed Doubles competition of the 2011 SEA Games. Tanasugarn decided not to participate. Ratiwatana partnered with Varatchaya Wongteanchai but the pair lost in the quarterfinals to Denise Dy and Treat Conrad Huey. Dy and Huey eventually won the title by beating Jessy Rompies and Christopher Rungkat 4–6, 6–3, [10–6] in the final.
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
John Paul Fruttero and Raven Klaasen were the defending champion but chose not to compete.
Top Seeds Juan Sebastián Cabal and Robert Farah claimed the title defeating Yuki Bhambri and Wang Chieh-fu 6–4, 6–2
Christopher Rungkat was the defending champions having won the event in 2011, but lost in the quarterfinals to Jeson Patrombon.
Denise Dy and Treat Huey were the defending champions and successfully defended their title, defeating Peangtarn Plipuech and Sonchat Ratiwatana in the final, 7–6, 6–4.
The 2016 Manila Challenger was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2016 ATP Challenger Tour. It took place in Manila, Philippines between 18 and 24 January 2016.
This was the first edition of the tournament.
Gong Maoxin and Yi Chu-huan were the defending champions but chose to defend their title with different partners. Gong partnered Zhang Ze but lost in the quarterfinals to Ruben Gonzales and Hsieh Cheng-peng. Yi partnered Yuya Kibi but withdrew from the tournament due to a Kibi injury.
Luke Saville and Jordan Thompson were the defending champions but chose not to defend their title.
Hsieh Cheng-peng and Yang Tsung-hua were the defending champions but lost in the semifinals to Sanchai and Sonchat Ratiwatana.
Sanchai and Sonchat Ratiwatana of Thailand were the defending champions and successfully defended their title, defeating Francis Casey Alcantara and Ruben Gonzales of the Philippines in the final, 6–4, 2–6, [10–7].
Denise Dy and Treat Huey were the defending champions having won the event in 2015, but Huey chose not to participate
Matt Reid and John-Patrick Smith were the defending champions but chose not to defend their title.
Sanchai and Sonchat Ratiwatana were the defending champions but lost in the quarterfinals to Hsieh Cheng-peng and Yang Tsung-hua.
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.
Brydan Klein and Joe Salisbury were the defending champions but chose not to defend their title.
Sanchai Ratiwatana (THA)
Ruben Gonzales (PHI)
