Sanchai Ratiwatana (Thai: สรรค์ชัย รติวัฒน์, pronounced [sǎn.t͡ɕʰāj rá(ʔ).tī.wát]), nicknamed Tong (ต้อง, [tɔ̂ŋ]; born 23 January 1982), is a professional tennis player from Thailand. He turned professional in 2004. 
In 2007, Sanchai and his twin brother Sonchat Ratiwatana won their first ATP doubles title in Bangkok. They won their second title at the Chennai Open in India in 2008. 
He reached World No. 39, his best doubles ranking, on 28 April 2008. 
  ATP career finals
 Doubles: 3 (2 titles, 1 runner-up)
    |   | Legend |   | Grand Slam tournaments (0–0) |   | ATP World Tour Finals (0–0) |   | ATP World Tour Masters 1000 (0–0) |   | ATP World Tour 500 Series (0–1) |   | ATP World Tour 250 Series (2–0) |  |   | Titles by surface |   | Hard (2–1) |   | Clay (0–0) |   | Grass (0–0) |  |   | Titles by setting |   | Outdoor (1–0) |   | Indoor (1–1) |  | 
  ATP Challenger Tour finals
 Doubles: 81 (48–33)
   | Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score | 
  | Win | 1–0 | Oct 2003 | Dharwad, India | Hard |  Sonchat Ratiwatana |  Prakash Amritraj 
  Rik de Voest | 3–6, 6–3, 7–5 | 
  | Win | 2–0 | Apr 2004 | Busan, South Korea | Hard |  Sonchat Ratiwatana |  Satoshi Iwabuchi 
  Tasuku Iwami | 6–7(5–7), 7–6(7–1), 6–4 | 
  | Win | 3–0 | Aug 2004 | Belo Horizonte, Brazil | Hard |  Sonchat Ratiwatana |  Marcos Daniel 
  Iván Miranda | 6–2, 7–5 | 
  | Win | 4–0 | Nov 2004 | Reunion Island, Réunion | Hard |  Sonchat Ratiwatana | .svg.png) Michel Kratochvil 
  Jiří Vaněk | w/o | 
  | Loss | 4–1 | Jan 2005 | Waikoloa, United States | Hard |  Sonchat Ratiwatana |  André Sá 
  Eric Taino | 6–7(2–7), 6–3, 6–7(2–7) | 
  | Win | 5–1 | Feb 2005 | Cherbourg, France | Hard(i) |  Sonchat Ratiwatana |  Jean-Christophe Faurel 
  Nicolas Renavand | 6–3, 6–2 | 
  | Loss | 5–2 | Nov 2005 | Busan, South Korea | Hard |  Sonchat Ratiwatana | .svg.png) Ashley Fisher 
  Tripp Phillips | 5–7, 3–6 | 
  | Loss | 5–3 | Mar 2006 | Cherbourg, France | Hard(i) |  Sonchat Ratiwatana |  Jean-François Bachelot 
  Stéphane Robert | 6–7(5–7), 3–6 | 
  | Win | 6–3 | Apr 2006 | Chikmagalur, India | Hard |  Sonchat Ratiwatana |  Lu Yen-hsun 
  Danai Udomchoke | 6–3, 6–2 | 
  | Loss | 6–4 | Apr 2006 | Dharwad, India | Hard |  Sonchat Ratiwatana |  Kamil Čapkovič 
  Lukáš Lacko | 3–6, 5–7 | 
  | Win | 7–4 | May 2006 | Fergana, Uzbekistan | Hard |  Sonchat Ratiwatana |  Alexey Kedryuk 
  Orest Tereshchuk | 6–7(7–9), 7–6(7–3), [14–12] | 
  | Win | 8–4 | Jul 2006 | Lexington, United States | Hard |  Sonchat Ratiwatana |  John Isner 
  Colin Purcell | 7–6(7–5), 4–6, [10–6] | 
  | Loss | 8–5 | Nov 2006 | Busan, South Korea | Hard |  Sonchat Ratiwatana |  Alexander Peya 
  Björn Phau | 7–6(7–3), 3–6, [6–10] | 
  | Win | 9–5 | Mar 2007 | Kyoto, Japan | Carpet(i) |  Sonchat Ratiwatana |  Rajeev Ram 
  Bobby Reynolds | 6–4, 6–3 | 
  | Win | 10–5 | May 2007 | San Remo, Italy | Clay |  Sonchat Ratiwatana | .svg.png) Steve Darcis 
 .svg.png) Stefan Wauters | 7–6(7–3), 6–3 | 
  | Win | 11–5 | Jun 2007 | Lugano, Switzerland | Clay |  Sonchat Ratiwatana | .svg.png) Jean-Claude Scherrer 
  Lovro Zovko | 6–4, 6–4 | 
  | Win | 12–5 | Jul 2007 | Granby, Canada | Hard |  Sonchat Ratiwatana |  Satoshi Iwabuchi 
  Philip Stolt | 6–2, 7–6(7–4) | 
  | Loss | 12–6 | Oct 2007 | Seoul, South Korea | Hard |  Sonchat Ratiwatana |  Rik de Voest 
  Lu Yen-hsun | 3–6, 5–7 | 
  | Loss | 12–7 | Oct 2008 | Seoul, South Korea | Hard |  Sonchat Ratiwatana |  Łukasz Kubot 
  Oliver Marach | 5–7, 6–4, [6–10] | 
  | Win | 13–7 | Jan 2009 | Salinas, Ecuador | Hard |  Sonchat Ratiwatana |  Juan Pablo Brzezicki 
  Iván Miranda | 6–3, 7–6(7–5) | 
  | Win | 14–7 | Feb 2009 | Wrocław, Poland | Hard(i) |  Sonchat Ratiwatana |  Benedikt Dorsch 
  Sam Warburg | 6–4, 3–6, [10–8] | 
  | Win | 15–7 | Mar 2009 | Melbourne, Australia | Hard |  Sonchat Ratiwatana |  Chen Ti 
  Danai Udomchoke | 7–6(7–5), 5–7, [10–7] | 
  | Loss | 15–8 | Mar 2009 | Khorat, Thailand | Hard |  Sonchat Ratiwatana |  Rohan Bopanna 
  Aisam-ul-Haq Qureshi | 6–3, 6–7(5–7), [5–10] | 
  | Win | 16–8 | Apr 2009 | Mexico City, Mexico | Hard |  Sonchat Ratiwatana |  Víctor Estrella Burgos 
  João Souza | 6–3, 6–3 | 
  | Win | 17–8 | May 2009 | Busan, South Korea | Hard |  Sonchat Ratiwatana |  Tasuku Iwami 
  Toshihide Matsui | 6–4, 6–2 | 
  | Loss | 17–9 | Jul 2009 | Aptos, United States | Hard |  Sonchat Ratiwatana | .svg.png) Carsten Ball 
 .svg.png) Chris Guccione | 3–6, 2–6 | 
  | Loss | 17–10 | Nov 2009 | Seoul, South Korea | Hard |  Sonchat Ratiwatana |  Rik de Voest 
  Lu Yen-hsun | 6–7(5–7), 6–3, [6–10] | 
  | Loss | 17–11 | Dec 2009 | Salzburg, Austria | Hard(i) |  Sonchat Ratiwatana |  Philipp Marx 
  Igor Zelenay | 4–6, 5–7 | 
  | Loss | 17–12 | Jan 2010 | Salinas, Ecuador | Hard |  Sonchat Ratiwatana |  Jonathan Marray 
  Jamie Murray | 3–6, 4–6 | 
  | Win | 18–12 | Jan 2010 | Heilbronn, Germany | Hard(i) |  Sonchat Ratiwatana |  Mario Ančić 
  Lovro Zovko | 6–4, 7–5 | 
  | Loss | 18–13 | Aug 2010 | Granby, Canada | Hard |  Sonchat Ratiwatana |  Frederik Nielsen 
 .svg.png) Joseph Sirianni | 6–4, 4–6, [6–10] | 
  | Win | 19–13 | Sep 2010 | Bangkok, Thailand | Hard |  Sonchat Ratiwatana |  Frederik Nielsen 
  Yuichi Sugita | 6–3, 7–5 | 
  | Loss | 19–14 | Nov 2010 | Eckental, Germany | Carpet(i) |  Sonchat Ratiwatana |  Scott Lipsky 
  Rajeev Ram | 7–6(7–2), 4–6, [4–10] | 
  | Loss | 19–15 | Jan 2011 | Singapore, Singapore | Hard |  Sonchat Ratiwatana |  Scott Lipsky 
  David Martin | 7–5, 1–6, [8–10] | 
  | Loss | 19–16 | Mar 2011 | Guangzhou, China | Hard |  Sonchat Ratiwatana |  Michail Elgin 
  Alexandre Kudryavtsev | 6–7(3–7), 3–6 | 
  | Win | 20–16 | Aug 2011 | Beijing, China | Hard |  Sonchat Ratiwatana |  Harri Heliövaara 
  Michael Ryderstedt | 6–7(4–7), 6–3, [10–3] | 
  | Win | 21–16 | Sep 2011 | Shanghai, China | Hard |  Sonchat Ratiwatana |  Fritz Wolmarans 
  Michael Yani | 7–6(7–4), 6–3 | 
  | Win | 22–16 | Oct 2011 | Seoul, South Korea | Hard |  Sonchat Ratiwatana |  Purav Raja 
  Divij Sharan | 6–4, 7–6(7–3) | 
  | Win | 23–16 | Jan 2012 | Nouméa, New Caledonia | Hard |  Sonchat Ratiwatana |  Axel Michon 
  Guillaume Rufin | 6–0, 6–4 | 
  | Win | 24–16 | Feb 2012 | Kazan, Russia | Hard(i) |  Sonchat Ratiwatana |  Aliaksandr Bury 
  Mateusz Kowalczyk | 6–3, 6–1 | 
  | Win | 25–16 | Mar 2012 | Kyoto, Japan | Carpet(i) |  Sonchat Ratiwatana |  Hsieh Cheng-peng 
  Lee Hsin-han | 7–6(9–7), 6–3 | 
  | Loss | 25–17 | May 2012 | Fergana, Uzbekistan | Hard |  Sonchat Ratiwatana |  Raven Klaasen 
  Izak van der Merwe | 3–6, 4–6 | 
  | Win | 26–17 | Jul 2012 | Anning, China | Clay |  Sonchat Ratiwatana |  Ruan Roelofse 
  Kittipong Wachiramanowong | 4–6, 7–6(7–1), [13–11] | 
  | Win | 27–17 | Jul 2012 | Wuhan, China | Hard |  Sonchat Ratiwatana | .svg.png) Adam Feeney 
 .svg.png) Sam Groth | 6–4, 2–6, [10–8] | 
  | Win | 28–17 | Aug 2012 | Beijing, China | Hard |  Sonchat Ratiwatana |  Yuki Bhambri 
  Divij Sharan | 7–6(7–3), 2–6, [10–6] | 
  | Win | 29–17 | Sep 2012 | Shanghai, China | Hard |  Sonchat Ratiwatana |  Yuki Bhambri 
  Divij Sharan | 6–4, 6–4 | 
  | Win | 30–17 | Sep 2012 | Ningbo, China | Hard |  Sonchat Ratiwatana |  Gong Maoxin 
  Zhang Ze | 6–4, 6–2 | 
  | Loss | 30–18 | Nov 2012 | Yokohama, Japan | Hard |  Sonchat Ratiwatana |  Prakash Amritraj 
  Philipp Oswald | 3–6, 4–6 | 
  | Win | 31–18 | Mar 2013 | Cherbourg, France | Hard(i) |  Sonchat Ratiwatana |  Philipp Marx 
  Florin Mergea | 7–5, 6–4 | 
  | Win | 32–18 | Jun 2013 | Nottingham, United Kingdom | Grass |  Sonchat Ratiwatana |  Purav Raja 
  Divij Sharan | 7–6(7–5), 6–7(3–7), [10–8] | 
  | Loss | 32–19 | Jul 2013 | Eskişehir, Turkey | Hard |  Sonchat Ratiwatana |  Marin Draganja 
  Mate Pavić | 3–6, 6–3, [7–10] | 
  | Win | 33–19 | Sep 2013 | Shanghai, China | Hard |  Sonchat Ratiwatana |  Lee Hsin-han 
  Peng Hsien-yin | 6–3, 6–4 | 
  | Loss | 33–20 | Nov 2013 | Yokohama, Japan | Hard |  Sonchat Ratiwatana |  Bradley Klahn 
  Michael Venus | 5–7, 1–6 | 
  | Loss | 33–21 | Feb 2014 | New Delhi, India | Hard |  Sonchat Ratiwatana |  Saketh Myneni 
  Sanam Singh | 6–7(5–7), 4–6 | 
  | Win | 34–21 | Mar 2014 | Guangzhou, China | Hard |  Sonchat Ratiwatana |  Lee Hsin-han 
  Amir Weintraub | 6–2, 6–4 | 
  | Loss | 34–22 | Mar 2014 | Kyoto, Japan | Carpet(i) |  Michael Venus |  Purav Raja 
  Divij Sharan | 7–5, 6–7(3–7), [4–10] | 
  | Win | 35–22 | May 2014 | Busan, South Korea | Hard |  Sonchat Ratiwatana |  Jamie Delgado 
 .svg.png) John-Patrick Smith | 6–4, 6–4 | 
  | Loss | 35–23 | Oct 2014 | Pune, India | Hard |  Sonchat Ratiwatana |  Saketh Myneni 
  Sanam Singh | 3–6, 2–6 | 
  | Loss | 35–24 | May 2015 | Taipei, Chinese Taipei | Carpet(i) |  Sonchat Ratiwatana | .svg.png) Matthew Ebden 
  Wang Chieh-fu | 1–6, 4–6 | 
  | Win | 36–24 | May 2015 | Busan, South Korea | Hard |  Sonchat Ratiwatana |  Nam Ji-sung 
  Song Min-kyu | 7–6(7–2), 3–6, [10–7] | 
  | Win | 37–24 | Nov 2015 | Kobe, Japan | Hard(i) |  Sonchat Ratiwatana |  Chen Ti 
  Franko Škugor | 6–4, 2–6, [11–9] | 
  | Win | 38–24 | Nov 2015 | Yokohama, Japan | Hard |  Sonchat Ratiwatana |  Riccardo Ghedin 
  Yi Chu-huan | 6–4, 6–4 | 
  | Loss | 38–25 | Mar 2016 | Guangzhou, China | Hard |  Sonchat Ratiwatana |  Alexander Kudryavtsev 
  Denys Molchanov | 2–6, 2–6 | 
  | Win | 39–25 | Apr 2016 | Gwangju, South Korea | Hard |  Sonchat Ratiwatana |  Frederik Nielsen 
  David O'Hare | 6–3, 6–2 | 
  | Loss | 39–26 | May 2016 | Busan, South Korea | Hard |  Sonchat Ratiwatana | .svg.png) Sam Groth 
  Leander Paes | 6–4, 1–6, [7–10] | 
  | Loss | 39–27 | Sep 2016 | Bangkok, Thailand | Hard |  Sonchat Ratiwatana |  Wishaya Trongcharoenchaikul 
  Kittipong Wachiramanowong | 6–7(9–11), 3–6 | 
  | Win | 40–27 | Sep 2016 | Kaohsiung, Chinese Taipei | Hard |  Sonchat Ratiwatana |  Hsieh Cheng-peng 
  Yi Chu-huan | 6–4, 7–6(7–4) | 
  | Win | 41–27 | Oct 2016 | Ho Chi Minh City, Vietnam | Hard |  Sonchat Ratiwatana |  Jeevan Nedunchezhiyan 
  Ramkumar Ramanathan | 7–5, 6–4 | 
  | Win | 42–27 | Jan 2017 | Bangkok, Thailand | Hard |  Sonchat Ratiwatana |  Sadio Doumbia 
  Fabien Reboul | 7–6(7–4), 7–5 | 
  | Win | 43–27 | Feb 2017 | Kyoto, Japan | Hard(i) |  Sonchat Ratiwatana | .svg.png) Ruben Bemelmans 
 .svg.png) Joris De Loore | 4–6, 6–4, [10–7] | 
  | Win | 44–27 | Mar 2017 | Shenzhen, China | Hard |  Sonchat Ratiwatana |  Hsieh Cheng-peng 
  Christopher Rungkat | 6–2, 6–7(5–7), [10–6] | 
  | Loss | 44–28 | Apr 2017 | Taipei, Chinese Taipei | Carpet(i) |  Sonchat Ratiwatana | .svg.png) Marco Chiudinelli 
  Franko Škugor | 6–4, 2–6, [5–10] | 
  | Loss | 44–29 | May 2017 | Busan, South Korea | Hard |  Sonchat Ratiwatana |  Hsieh Cheng-peng 
  Peng Hsien-yin | 5–7, 6–4, [8–10] | 
  | Win | 45–29 | Jul 2017 | Winnetka, United States | Hard |  Christopher Rungkat |  Bradley Klahn 
  Kevin King | 7–6(7–4), 6–2 | 
  | Win | 46–29 | Oct 2017 | Kaohsiung, Chinese Taipei | Hard |  Sonchat Ratiwatana |  Jonathan Erlich 
  Alexander Peya | 6–4, 1–6, [10–6] | 
  | Win | 47–29 | Nov 2017 | Hua Hin, Thailand | Hard |  Sonchat Ratiwatana |  Austin Krajicek 
  Jackson Withrow | 6–4, 5–7, [10–5] | 
  | Loss | 47–30 | Mar 2018 | Yokohama, Japan | Hard |  Sonchat Ratiwatana |  Tobias Kamke 
  Tim Pütz | 6–3, 5–7, [10–12] | 
  | Loss | 47–31 | May 2018 | Gimcheon, South Korea | Hard |  Sonchat Ratiwatana |  Ruan Roelofse 
  John-Patrick Smith | 2–6, 3–6 | 
  | Loss | 47–32 | Oct 2018 | Stockton, United States | Hard |  Christopher Rungkat |  Darian King 
  Noah Rubin | 3–6, 4–6 | 
  | Win | 48–32 | Oct 2018 | Fairfield, United States | Hard |  Christopher Rungkat |  Harri Heliövaara 
 .svg.png) Henri Laaksonen | 6–0, 7–6(11–9) | 
  | Loss | 48–33 | Jan 2020 | Bangkok, Thailand | Hard |  Christopher Rungkat |  Andrey Golubev 
  Aleksandr Nedovyesov | 6–3, 6–7(1–7), [5–10] | 
 Grand Slam doubles timeline
  Key   | W | F | SF | QF | #R | RR | Q# | DNQ | A | NH | 
 (W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent;  (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record. 
 To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
  External links