Rio de Janeiro - Singapore shooter Jasmine Ser missed out on the final of the 50m rifle three positions on Thursday morning (Aug 11, Brazil time).
Her score of 568 in the qualification fell short of making the final eight, finishing 34th overall.
While the Singaporean started off steady with a 97 in her opening series in the kneeling position, a 93 in the second series set her back, with a strong comeback needed in the prone and kneeling positions.
She posted a 95 and 95 in the prone, followed by 91 and 97 standing.
Ser said: "It didn't go as I expected, but I tried. Until the very last shot, I tried. Kneeling is my strongest position, so after a 190 for that, I was clearly disappointed with myself. There's no excuse. I wanted to cling on to whatever shots were left for prone and standing but it did not go my way.
"It (her experience in Rio) opens an opportunity for me to climb back up again from this score and look forward to the next few competitions. I will continue this motto (of hanging on until the end) until I finish my career.
"I did not qualify in 2012, so I said I would qualify for Brazil. I think I said it wrongly. This time, I won't say that I'm going to qualify, but I'm going to win in 2020."
The 51-strong field included world-class shooters such as world record holder (qualification) Snejzana Pejcic of Croatis and China's veteran shooter Du Li, already a medallist in the 10m air rifle.
The 25-year-old Singaporean also competed in the 10m air rifle event, finishing 25th overall. Ser is competing in her second Olympics, qualifying for the Rio Games after competing in London on an unused quota place.