National swimmer Shana Lim made up for the disappointment of missing out on the 2013 South-east Asian (SEA) Games through injury by booking her place in next year's Singapore edition.

The 21-year-old won the women's 50m backstroke event at the Singapore National Swimming Championships on Thursday with a time of 29.85sec, which was just inside the Games qualifying mark of 29.96.

The 2015 Games, held from June 5-16, will also be Lim's swansong in the biennial Games, in which she has competed three previous times (2007, 2009 and 2011), winning three relay golds.

Also posting times under the SEA Games 'A' marks at the OCBC Aquatic Centre on Thursday night were Quah Ting Wen, 22, and Amanda Lim, 21, who both finished first and second in the 100m freestyle with times of 56.38 and 56.51 respectively. Their timings were narrowly inside the 56.63 window.

Quah's younger brother Zheng Wen, 18, bagged the men's 200m backstroke in 2min 5.05secs while Malcolm Low, 17, finished second in 2:05.30. Both were under the 'A' mark of 2:05.38.

In the men's 200m butterfly, 15-year-old Dylan Koo clocked 2:02.95 to win the gold medal and has put himself in the running for a spot in next year's squad. The 'A' mark for the event is 2:04.20.