Wattana won in 1986 at the age of 16, his first major tournament, the Camus Thailand Masters. In 1989 he went on professional level play, after having won the World Amateur Championship in 1988. The highlight of his career was the mid-1990s, when he twice won the Thailand Open and managed to get the third place in the world rankings. The top of the professional snooker was until then dominated by British, and to a lesser extent Irish, Canadians and Australians.
Wattana was the eighth professional player that over 1 million pound sterling in prize money won. In 2007, his total amount of prize money £ 1.75 million. He is one of only four players ever knew more than two maximum breaks to score; in 1991, 1992 and 1997.
Meanwhile, Wattana dropped to the 93rd place on the world rankings. He was the first snooker player since 1992 that on a World Snooker Championship a match 10-0 lost. This happened in 2005 in the last qualifying round against Allister Carter. In 2008, the World Amateur Championships in Austria, but lost to eventual champion Thepchaiya Un Nooh. He won the Asian Championships in 2009.
- Thailand Masters – 1986
- Hong Kong Challenge – 1990
- Humo Masters – 1992
- World Matchplay – 1992
- Strachan Open – 1992
- Thailand Open – 1994, 1995
- ACBS Asian Championship – 1986, 1988, 2009
- IBSF World Amateur Championship – 1988