Ethan Ewing and Morgan Cibilic are the last Australian surfers standing in the Rio Pro after navigating their way to the quarter-finals in Saquarema, Brazil.
The women's field was cut down to the final four with teen phenom Tya Zebrowski making her first semi-final by downing five-time world champion Carissa Moore, 12.70 to 7.77.
Zebrowski, 15, overcame Australian great Stephanie Gilmore in the opening round of the sixth tour stop of the year.
"I don't really have a secret. I just didn't really think about it when I was against Steph (Gilmore), but of course I was thinking about it going against Carissa (Moore)," said French Tahitian Zebrowski.
"She beat me in Snapper, so I really didn't want her to beat me again. I just tried to stay focused on myself, not watch her too much, and stay focused on my game."