Dipna Lim-Prasad smashed Prema Govindan's 29-year-old national mark for the women's 200 metres on Saturday.
But the new record-holder will not represent Singapore in the event at December's South-east Asia (SEA) Games in Napyidaw, Myanmar.
Lim-Prasad clocked 24.36 seconds to take the 200m gold medal on the first day of the Singapore U-23 Open Athletics Championships at the Choa Chu Kang Stadium.
The 22-year-old was 0.21 seconds faster than 100m record-holder Shanti Pereira, who equalled Govindan's record of 24.54 at July's IAAF World Youth Championships in Donetsk, Ukraine.
While she was delighted to set the record, Lim-Prasad isn't looking to add the 200m event to the ones she has already qualified for - the 400m hurdles and the 4x400m relay.
New personal best
The 2012 Olympian told The New Paper on Saturday: "I'm always happy because it's a new personal best and with this speed, it will probably help with my 400m hurdles and the 4x400m relay at the SEA Games.
"Shanti is so talented and young. When I was her age, I was running a few seconds slower than this.
"I was in the lane ahead of her and I could hear her behind me. It was quite intimidating, but we definitely pushed each other."