Her pre-competition goal was just to finish, but Teegan Ashby beat three Olympic medallists to claim the Canberra International Horse trials three-star crown at Equestrian Park on Sunday.
The youngest competitor in the field, the 20-year-old and her horse Rockingham No Reason blitzed the field in the final cross country stage.
A member of the 2016 Olympics national development squad, Ashby edged out 2008 Olympic silver medallist Megan Jones, with fellow Olympians Stuart Tinney and Shane Rose fourth and fifth respectively.
The win was a shock for the Howlong native, given it was her and her horse's maiden three-star competition.
She was fifth after dressage and fourth after showjumping during Saturday's competition, but clocked the quickest cross country time on Sunday to leap to the top of the standings.
It has given her belief she can one day stand on an Olympic podium.
"My goal was just to make it through cross country, just to finish was a win in itself for me," she said.
"I was the youngest in the competition this weekend, and the youngest in the Rio squad.
"I'd like to think Rio's an option as long as he [the horse] keeps performing as well as he did here.
"I've been earmarked as one who may or may not make it - it's good to have that support from the selectors behind me."
Jones also had to settle for second in the two-star class behind Sydney's Christine Bates, with Andrew Cooper third.