ASU takes on the host Volunteers Saturday afternoon and then either Columbia or Oklahoma State on Sunday.
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.
Pac-12 Men’s Tennis Player of the Week: Daniel Cukierman, Jr., USC / Pac-12 Women’s Tennis Player of the Week: Michaela Gordon, Jr., Stanford
Sandkaulen was the No. 1 seed heading into the tournament, while Rakotomalala did not earn a seed from the tournament.