Thassha Vitayaviroj (; 10 June 1986) is a former professional Thai tennis player.
Vitayaviroj has career-high WTA rankings of 439 in singles, achieved on 2 May 2005, and 320 in doubles, set on 24 April 2006. She won five doubles titles on the ITF Women's Circuit. Her only WTA Tour main-draw appearance came at the 2002 Volvo Women's Open, where she partnered with Montinee Tangphong in the doubles event.
Playing for Thailand Fed Cup team, Vitayaviroj has a win–loss record of 0–1.
ITF finals $10,000 tournaments
Singles (0–1) ResultDateTournamentSurfaceOpponentScoreLoss 3 October 2004 Balikpapan, Indonesia Hard Napaporn Tongsalee 4–6, 5–7
Doubles (5–7) ResultNo.DateTournamentSurfacePartnerOpponentsScoreWin 1. 9 November 2003 Pune, India Hard Montinee Tangphong Geeta Manohar Archana Venkataraman 4–6, 7–5, 6–4Win 2. 19 January 2004 New Delhi, India Hard Montinee Tangphong Satomi Kinjo Tomoyo Takagishi 3–6, 6–0, 6–3Loss 1. 9 May 2004 Jakarta, Indonesia Hard Liza Andriyani Septi Mende Wukirasih Sawondari 4–6, 3–6Loss 2. 30 August 2004 New Delhi, India Hard Montinee Tangphong Rushmi Chakravarthi Sai Jayalakshmy Jayaram w/oLoss 3. 26 September 2004 Jakarta, Indonesia Hard Liza Andriyani Latisha Chan Pichittra Thongdach 3–6, 4–6Loss 4. 24 October 2004 Pune, India Hard Wilawan Choptang Akgul Amanmuradova Sai Jayalakshmy Jayaram 3–6, 6–4, 3–6Win 3. 30 October 2005 Mumbai, India Hard Wilawan Choptang Nicole Clerico Ksenia Palkina 5–7, 7–5, 6–3Winner 4. 1 April 2006 Mumbai, India Hard Nudnida Luangnam Natasha Khan Claire Peterzan 3–3 ret.Runner-up 5. 8 April 2006 Chennai, India Clay Nudnida Luangnam Cho Jeong-a Kim Ji-young 4–6, 4–6Runner-up 6. 30 July 2006 Bangkok, Thailand Hard Wilawan Choptang Ayu Fani Damayanti Nudnida Luangnam 2–6, 2–6Win 5. 12 November 2006 Manila, Philippines Hard Kao Shao-yuan Kim Jung-eun Lim Sae-mi 6–2, 7–5Loss 7. 19 November 2006 Manila, Philippines Hard Kao Shao-yuan Noppawan Lertcheewakarn Varatchaya Wongteanchai 6–3, 3–6, 6–7(2)
Fed Cup participation Doubles EditionStageDateLocationAgainstSurfacePartnerOpponentsW/LScore 2006 Fed Cup 2006 Fed Cup World Group II Play-offs P/O 16 July 2006 Bratislava, Slovakia Slovakia Hard (i) Nudnida Luangnam Janette Husárová Magdaléna RybárikováL 2–6, 3–6
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