The Ho Chi Minh City-based player defeated Trinh Linh Giang of Hanoi 6-1, 6-2, 6-2 in the men's final match.
Thien, who was the first Vietnamese to compete at the AustralianOpen's junior category two years ago, dominated Giang throughout thematch.
His strong serves kept Giang at the baselinethroughout the match. Also, Giang was unable to resist attacks at thenet from Thien, who received strong home support. Giang lost three breakpoints in the first set, two each in the remaining two matches, whilenot winning a break point against Thien.
TheDecember 30 Masters final was the first for both players. And it is thefirst title for Thien in three of the largest national tournaments ofthe year. Giang has not won a title this year.
TheMasters, an end-of-year tournament, offers a total of 280 million VND(13,300 USD) in prize money. The cream of the crop will be selected forthe country's David Cup and the Fed Cup qualification rounds.-VNA