Sonchat Ratiwatana
Sonchat Ratiwatana, nicknamed Ton is a professional tennis player from Thailand. In 2007, Sonchat and his twin brother Sanchai Ratiwatana won their first ATP doubles title in Bangkok in their home country. In the final, the team beat 2007 Wimbledon men's doubles winner Michaël Llodra and 2007 U.S. Open men's doubles semifinalist Nicolas Mahut. He reached his highest doubles ranking at world number 39 as of 28 April 2008. He plays right-handed and turned professional in 2004. He and his twin brother played in their first grand slam tournament during the Australian Open in 2008, where they lost to the eventual finalist pairing of Arnaud Clément & Michaël Llodra of France in the first round.
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 |  Sanchai Ratiwatana |  Michaël Llodra Nicolas Mahut | 3–6, 7–5, |
| Win | 2–0 | 2008 Chennai Open – Doubles| | Chennai Open, India | International | Hard | Sanchai 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 | Sanchai Ratiwatana |  Mahesh Bhupathi Mark Knowles | 6–7, 2–6 |