Seven-time world champion Stephanie Gilmore’s dream of winning Olympic surfing’s first gold medal ended in a shock defeat on Monday after was bundled out in the third round at the Tokyo Olympics by unheralded South African Bianca Buitendag.

The Australian admitted that she lost because of being “too picky”. 

The 17th seed Buitendag took the lead at Tsurigasaki Beach by jumping on the first big wave of the contest, and Gilmore was left to rue her decision to let her have it.

“I looked at that wave and I thought, ‘it doesn’t look that it does not look good, so I let her have it and she turned it into a seven. That was the most frustrating thing for me,” said Gilmore, one of the favourites for the gold medal.

“There were a lot of waves but maybe not a lot of good ones. But in saying that, I probably got too picky,” she said.

Gilmore was joined in an early exit by French world number two Johanne Defay, who lost to Portugal‘s Yolanda Hopkins.

The two giant killings opened up the field for American world number one Carissa Moore, who was in action later in the morning.

But Gilmore was left with nothing but regrets after failing in her bid to add the Olympic gold medal to her bulging collection of world titles.

“That was the dream, that was the goal,” she said. “If you want to win, you’ve got to really want it bad.

“That was my mission and I’m super-disappointed that I didn’t make it happen, but there’s always Paris.”

Buitendag, who needed to come through the repechage second round to reach the head-to-head knockout stage, was happy to throw caution to the wind.

“I had nothing to lose, absolutely no pressure,” said the 1.85-metre (six feet) South African.

“I’m the underdog, coming in as the 17th seed for this event. So it was a really comfortable spot to be in. It takes away all the nerves and pressure. It just seemed to go my way.”

The men’s competition was set to resume later in the day, with Americans John John Florence and Kolohe Andino going head to head in the pick of the round.