Son took the men's title with an outstanding performance of nine wins and two draws. Title contender Le Quang Liem of HCM City was pushed to second place and Nguyen Van Huy of Hanoi came in third.
In the women's category, Nguyen dominated with 9.5 points after 11 matches. Her teammate Pham Bich Ngoc took the silver and HCM City's Nguyen Thi Thanh An bagged the bronze.
After the Rapid, the masters will continue with the National Blitz Chess Championships, in which world champion Liem will defend his title.
The tournament will end on May 17.
