China broke five individual meet records and both relay marks on an extraordinary opening finals night, Singapore's Dylan Jian Hong Lee took silver in the Boys 400m Freestyle, and Malaysia claimed the meet's first medal for its own program with bronze in the Boys 4x100m Freestyle Relay.
Day One of the 12th Asian Age Group Championships closed with seven meet records broken across the finals session — five individual, two relay — nearly all of them by China. Singapore's Dylan Jian Hong Lee took silver in the Boys 400m Freestyle, and Malaysia claimed its first medal of the meet in the closing relay.
Five of the six individual finals produced a meet record, and China's swimmers were behind all but one of them. Xinyang Zhou lowered her own morning mark in the Girls 100m Fly (15-17) to 59.54, while Zhuoxuan Li (Boys 400 Free, 15-17, 3:54.36), Heng Chen (Girls 400 Free, 15-17, 4:09.96) and Mohan Chang (Girls 200 IM, 15-17, 2:13.15) each broke records that had stood since 2015 or later. Vietnam's Tran Van Nguyen Quoc was the lone non-Chinese record-breaker, taking the Boys 400 Free 18+ mark down to 3:52.25.
China's 15-16 relay squads then broke both freestyle relay records on the night — the Boys 4x100 Free team stopping the clock at 3:23.42, the girls at 3:44.99.
Singapore's Dylan Jian Hong Lee took silver in the Boys 400m Freestyle, 13-14 Years, touching in 4:08.06 behind only Vietnam's Phan Quoc Khanh. It's the standout individual result of the night for either nation. Singapore also went close in the Boys 200m IM, 13-14 Years, where Dylan Wu finished fourth in 2:13.51 and Jaedon Rei Junrui Teo fifth in 2:16.30, and were fourth in the Boys 4x100 Free Relay, 13-14 Years (3:45.36) — just half a second behind Malaysia's bronze-winning time.
Malaysia's own first medal of the meet came in that same relay. The Boys 4x100m Freestyle Relay team in the 13-14 Years age group — Shyann Koo, Noah Abdul Rizal, Aedon Wei Zhe Lim and Muhammad Iriel Darwish — held third from start to finish, touching in 3:44.09 behind Japan and Thailand, and just ahead of Singapore.
Japan's team — the eventual gold medallists in that same final — were among the loudest in celebration poolside, a reminder of just how tight the field was at the top of the 13-14 age group all night.
Day 2 brings a fresh set of prelims and finals at the SAT Swimming Pool, Rajamangala National Stadium, with the 12th Asian Age Group Championships continuing through 21 July 2026. Full heat sheets, live results and photos from each session are available on the Heat Check and Gallery sections of the briefing page.