The Hawaiian delivered the highest scores in the first round of women's competition, executing a two-turn combo on a righthander to score nine of her combined heat tally of 16.83.
“I was just happy to sneak a few waves,” Moore said. “There wasn’t much in that heat and I’m just stoked that I got those.
"I always look forward to coming to the US Open and I look forward to this week of craziness. I’m just like surfing in front of all of the people. It’s a great platform to perform.”
Another Hawaiian, Malia Manuel, was victorious over local favourite Courtney Conlogue as the 18-year-old continued her bid to win the ASP Rookie of the Year award.
“Getting that round 1 win is extremely crucial because in round 2 anything can happen, especially out here,” Manuel said.
“That round two is do or die and I’m relieved to get 1st heat out of the way, so I’m very happy. The rookie of the year award is on my mind even though I’m trying not to think about it.
"It’d be amazing especially since women’s surfing has come such a long way. We’ll just see what happens, but it would be an extreme honour.”
Stephanie Gilmore and Lakey Peterson were among the day's other winners in the women's event, while on the men's side, Australia's Julian Wilson led the way.
The 23-year-old launched a massive frontside full-rotation 360 air to earn a near-perfect 9.87 to post an incredible 18.54 heat total.
“When that set came it was at the halfway point of the heat and I was feeling pretty comfortable,” Wilson said.
“It’s nice because it’s such a soft landing out there that you can pretty much do whatever you want. I just went for it and I’m happy that I had a good start out there.”
Women's round one results:
Heat 1: Malia Manuel (HAW) 14.03, Courtney Conlogue (USA) 12.74, Sarah Mason (NZL) 11.00
Heat 2: Lakey Peterson (USA) 15.60, Sage Erickson (USA) 13.67, Tyler Wright (AUS) 11.27
Heat 3: Stephanie Gilmore (AUS) 13.50, Rebecca Woods (AUS) 8.80, Dax McGill (HAW) 5.73
Heat 4: Sally Fitzgibbons (AUS) 13.93, Jacqueline Silva (BRA) 12.87, Paige Hareb (NZL) 10.56
Heat 5: Carissa Moore (HAW) 16.83, Sofia Mulanovich (PER) 10.44, Justine Dupont (FRA) 9.00
Heat 6: Coco Ho (HAW) 10.10, Laura Enever (AUS) 9.70, Pauline Ado (FRA) 8.76
Men's round of 96 results:
Heat 19: Brett Simpson (USA) 13.67, Nat Young (USA) 12.27, Jano Belo (BRA) 9.60, Heath Joske (AUS) 5.27
Heat 20: John John Florence (HAW) 12.87, Mitchel Coleborn (AUS) 9.87, Sunny Garcia (HAW) 8.23, Nic Muscroft (AUS) 6.00
Heat 21: Julian Wilson (AUS) 18.54, Davey Cathels (AUS) 10.50, Billy Stairmand (NZL) 7.04, Wiggolly Dantas (BRA) 6.29
Heat 22: Alejo Muniz (BRA) 15.77, Lincoln Taylor (AUS) 14.24, Brian Toth (PRI) 9.83, Richard Christie (NZL) 8.94
Heat 23: Travis Logie (ZAF) 14.10, Patrick Gudauskas (USA) 13.83, Rob Machado (USA) 11.43, Kai Barger (HAW) 8.58
Heat 24: Keanu Asing (HAW) 16.76, Joel Parkinson (AUS) 12.33, Hizunome Bettero (BRA) 11.60, Jonathan Gonzalez (CNY) 10.73