French Formula One star Romain Grosjean won the Race of Champions after beating Denmark's Tom Kristensen in the final at Rajamangala National Stadium on Sunday night.
Having defeated Formula One legends Sebastian Vettel and Michael Schumacher in earlier rounds, Grosjean had few problems against Le Mans expert Kristensen winning 2-0 in the best-of-three final before a big crowd.
Grosjean, 26, won the crown in his second ROC appearance, while 45-year-old Kristensen has failed to win the title in 13 attempts.
Eight-time Le Mans champion Kristensen also reached the final last year before losing to another Frenchman Sebastien Ogier.
On Sunday, Kristensen defeated Ogier in the quarter-finals while Grosjean finished off Vettel in the last eight and beat Schumacher in the last four.
"It's been a tough end to the F1 season but I finally got back on the podium," Grosjean said. "It's great to get this win before I head off for a holiday. Thanks to everyone in Thailand because the welcome has been fantastic."
Kristensen said small mistakes cost him the title this year.
"Romain is a deserved winner," said Kristensen, who beat former Formula One driver David Coultard in the semi-finals. "I'm getting closer every year. It was a small gap between us in each of the heats. I made small mistakes but that's the challenge of the Race Of Champions in jumping into different cars."
Local hopefuls Nattavude Charoensukawattana and Tin Sritrai failed to reach the knockout stages.
Thailand will host next year's edition under a two-year contract. Thai officials hope the Race of Champions will lead to the country getting approval to organise a Formula One race.
They claim Formula One supremo Bernie Ecclestone has agreed in principle for the kingdom to host a Grand Prix in 2014 but a formal deal has not yet been reached.