Swimmer Darren Lim, 14, won the race to become Singapore's fastest man at the Singapore National Swimming Championships held at the Singapore Sports School.
His time of 22.73sec clocked in the morning's heats also came close to the long-standing national record of 22.69 timed by Ang Peng Siong in 1982.
Darren did not improve on his time in the finals but his time of 22.87 was still good enough for gold. In second place was Russell Ong, 24, with 23.33 and third was China's Weiwen in 23.77.
Besides Darren and Ong, another four swimmers made the cut for December's SEA Games - Samantha Yeo and Cheryl Lim (200m breaststroke) and Quah Ting Wen and Lynette Lim (200m freestyle).