"I have done one of these before at the Mount and I wasn't really expecting anything big," Scott said.
"I have recently moved from Gisborne to the High Performance Centre in Auckland and have had a massive week. They said the only way I could get this morning's training session off was if I win this. I felt really good.
"Navigating is not too hard as the buoys are so big and so bright. Between the two islands is quite choppy and that gets in the way a bit and I swallowed a bit of water.
"Hopefully I can win a few more. We will have to see what happens throughout the series."
While the young guns dominated the top placings, veteran Foster caused a stir by rolling back the years to show the speed that saw him crowned the inaugural Sand to Surf winner back in 2004.
"I have a surf background and I like coming to the Mount," he said.
"I stuck with (Scott) going out through the breakers and it was nice having a little bit of surf. It was super clear out there which was beautiful. I managed to find the winner's feet there for a bit and then he got away from me around the back of the island.
"There were a few jellyfish and I looked up at one point as I heard a whole lot of splashes which gave me a hell of a fright. It was a couple of birds, not sharks thankfully."
In the women's race, Charlotte Webby won her third straight title in a smart time of 31m 57s with just the three fastest male swimmers ahead of her.
"It was a bit rough out there and a bit cold but I'm pretty happy. I didn't see too many boys in front of me but I just really wanted to go out there and race," Webby said.
"I haven't raced in a while so just build some confidence back up.
"I like the Mount. It is a great place to swim and around the islands is pretty exciting. The sea is really clear. I am fortunate not to get stuck on the rocks yet and obviously if I swam into them I would have been a different story, but I have been pretty lucky."
Results: Click HERE