"I'm happy, I definitely went better in the first race than the second, the strong winds suit me way better so I really enjoyed this morning," ten Have says.
Van der Zalm enjoyed his day, scoring a ninth and 10th placing to sit in 15th overall.
"I think I sailed well so I'm pretty happy. It's been a blast and I'm getting a lot out of this experience," van der Zalm says.
The boardsailors have another three days of competition.
Ten Have has gone into the Youth Olympic Games with high hopes because 2018 has been a bit of a breakthrough year for her, and she wants to step up a couple more rungs with success at the Youth Olympic Games in Argentina.
Meanwhile, earlier this week Tauranga climber Sarah Tetzlaff set a New Zealand record on the sport's debut at the 2018 event, flying up the speed wall to set a New Zealand record.
She hit the top buzzer in a time of 12.72s, shaving off almost half a second from the previous record of 13.14s.
Kiwi triathlete Dylan McCullough, who has family in the Western Bay, claimed New Zealand's first gold medal at the 2018 Youth Olympic Games, taking out the men's triathlon with a final time of 53m 27s - 12 seconds ahead of Portuguese silver medallist Alexandre Monties.
For a full list of results and for the Games schedule visit Olympic.org.nz.