Stoupe's win follows a couple days after fellow freshman Christian Lerby also put up his first collegiate win against GCU to showcase the young talent on the ASU squad.
The win marked the first on the season for the men in their season-opener against the Lopes.
The freshman was also joined by fellow teammates George Stoupe and Will Kirkman in California.
Sandkaulen was the No. 1 seed heading into the tournament, while Rakotomalala did not earn a seed from the tournament.
The Classic features three teams ranked in the Oracle/ITA top-25, and six in the top-50.
Sun Devil men's tennis' Andrea Bolla and Tim Ruehl notched four-straight wins to fight into the final of the tournament.