The Tigers improved to 15-6-2 as they advance to a second round match on Friday vs. Maryland. That game will be played in Stillwater, Okla.
Frierson, the SEC Tournament MVP, started the scoring 17 minutes into the action with a shot into the upper right corner of the goal.
Ball's goal 12 minutes into the second half put the Tigers up 2-0. The freshman chested a header from Kim Spence before scoring her fourth goal of the season.
Utah State, the WAC Tournament champion, scored its only goal with 26:54 remaining. The Aggies ended their season with a 15-5-2 record.
"First, I'll say that Utah State played a great game," Auburn coach Karen Hoppa said. "They gave themselves a chance to win the game late by scoring a good goal. That is a real quality team that we beat tonight.
"I thought we scored two world-class goals," Hoppa added. "The individual efforts by Katie Frierson and Tori Ball were tremendous. That was the difference in the game."