Sanchai Ratiwatana
Sanchai Ratiwatana, nicknamed Tong 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)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | 2007 Thailand Open – Doubles| | Thailand Open, Thailand | International | Hard |  Sonchat Ratiwatana |  Michaël Llodra Nicolas Mahut | 3–6, 7–5, |
| Win | 2–0 | 2008 Chennai Open – Doubles| | Chennai Open, India | International | Hard | Sonchat Ratiwatana |  Marcos Baghdatis Marc Gicquel | 6–4, 7–5 |
| Loss | 2–1 | 2008 Regions Morgan Keegan Championships – Doubles| | U.S. National Indoor Tennis Championships, US | Intl. Gold | Hard | Sonchat Ratiwatana |  Mahesh Bhupathi Mark Knowles | 6–7, 2–6 |