Thailand's Puripol Boonson celebrates winning gold in the men's 100m at the 31st SEA Games in Hanoi yesterday. (AFP photo)Thai teenage sensation Puripol Boonson won the men's 100m title to complete a hat-trick of sprint crowns at the 31st SEA Games in Vietnam on Wednesday. In the 200m in Si Sa Ket, Puripol crossed the line in 20.58sec, breaking the national mark of 20.69sec set by Reanchai at the 1999 SEA Games. In the 200m in Hanoi, his winning time of 20.37sec broke the SEA Games record and his own national mark. Hosts surpass century markVietnam have surpassed the 100-gold mark at the 31st SEA Games on home soil.