Mona McSharry finished fifth in the final of the 50m freestyle at the Youth Olympic Games in Buenos Aires on Friday night.
The Sligo swimmer set a new Irish senior record in qualifying second fastest in the semi-finals behind Czech Barbora Seemanova but she missed out on the medals after clocking a time of 25.54.
McSharry swam 25.76 in the morning heats but smashed her previous record with 25.42 in the evening.
Earlier, in the men's 100m freestyle, Robbie Powell improved on his performance in the heats to finish sixth in his semi-final.
Powell swam 51.19 in the morning and was the 15th fastest qualifier but improved to 50.76 and 11th overall tonight.
Limerick’s Sophie Meridith made her Youth Olympics debut in the women’s long jump. She is ranked tenth after a longest jump of 5.59 metres. The competition resumes on Sunday.
In golf, Lauren Crowley Walsh finished in a tie for 13th in the women's individual stroke play after a third and final round of 75 (+5), which left her nine shots behind the medal places.
David Kitt finished in 25th place in the men's stroke play after a third round of 80 (+10).
Earlier this morning, badminton prospect Nhat Nguyen just missed out on a medal with a narrow quarter-final loss to fifth seeded Chinese player Li Shifeng.
The 18-year old, who was regarded as one of Ireland's best medal chances at the Games, took the first set on a 21-15 scoreline but was pipped 21-19 in the remaining two sets.
Galway gymnast Emma Slevin also qualified for two more finals after a superb performance on the balance beam netted her a fourth place with a 12.433 score.
This display assures her of a place in both the balance beam final and the all-around finals, which get underway tomorrow.