The 31-year-old, who was in a five-way tie for the overnight lead, fired a flawless five-under-par 67 to win by two strokes from Thailand's Chapchai Nirat, who signed off with a 69 in the 750,000-dollar tournament.

Australian Terry Pilkadaris finished a further stroke back after charging into contention at the Thai Country Club with a bogey-free 66.

Taiwan's Lin Wen-tang came in tied sixth to virtually assure himself a place in the world's top-50 and also a spot in the US Masters next year.

Lam, who posted a winning 14-under-par 274 total, hit three birdies over his closing four holes.

'Unbelievable. I have won a bunch of small ones before but this is just unbelievable. It was such a jam-packed leaderboard and I'm just so glad I went out and finished the job,' said Lam, who picked up a cheque for 135,000 dollars to finish 16th on the final Asian Tour Order of Merit.

'To win on the Asian Tour has been a dream of mine. I always thought I could win one and to do it is unbelievable.' Showing the form that saw him challenge for the Barclays Singapore Open and finish second at the Johnnie Walker Cambodian Open last week, Lam seized the advantage with a tidy front nine 34.

Pilkadaris made a move with his own run of four birdies on the inward nine but Lam pulled out some wonderful iron approach shots to birdie the 15th, 16th and 18th holes to seal his career breakthrough.

Big-hitting Chapchai, who was looking to extend the Thai stranglehold at the Volvo Masters of Asia following wins by Thongchai Jaidee and Prayad Marksaeng, hit a double bogey and bogey in the first three holes.

But he fought back with a superb inward 31 to settle for second place and said a shoulder injury on Saturday had affected his performance.

India's Jeev Milkha Singh wrapped up his stunning season with a tied 37th finish and was officially crowned the Order of Merit champion with total winnings of 1.45 million dollars.

Prayad, last year's winner, finished tied 12th to leave his world top-50 and US Masters hopes hanging by a thread as Rory McIlroy can pip him with a top-29 finish at the South African Open on Sunday. -- AFP