New Zealander Lydia Ko dropped six shots in the final three holes to finish with a share of 39th place at the US Open in Wisconson on Monday (NZT).
She carded a disappointing three-over par final round 75 for a 12-over total at the testing Blackwolf Run course.
If Ko had parred her way in from the 16th, she would have finished in a share of 18th place, but she faded in the run in, ending her day with a triple bogey at the last.
Ranked No.1 in the world, Ko led the amateur ranks in finishing one shot ahead of American Emma Tally.
The 15-year-old Aucklander says she's learned a lot from playing with the world's top professionals.
"I think playing different kinds of shots, and managing stress and coping with stress - those are just experiences playing with the pros," she said.
Ko remains in the States to play in the US Amateur in Cleveland, Ohio, beginning on August 6.She'll also have a chance to better her US Open result at the British Open at Royal Liverpool from September 13-16.