Perez shot an even-par 72 to take a four-shot lead into the final round over Arron Oberholser, who carded a 1-over-par 73 on Saturday.
Perez and Oberholser, who is competing in just his third Tour event of the season, are two of just three players under par through three rounds. The other is Michael Allen. At 1-under-par, Allen is five off the lead entering the final round.
J.J. Henry, Charlie Wi, R.W. Eaks and Kris Cox are all tied for 4th at even par. Henry fired the lowest round of the day, a 2-under-par 70. In fact, only seven of the 57 players in the field managed to break par on Saturday.
Rob Bradley, who entered the third round three back of Perez, is now eight shots back after a third-round 5-over-par 77.
Perez is in search of his second Tour victory of the season. He captured the Wichita Open in a playoff in July. Still, the 24-year-old is trying to jump into the top 15 on the money list. Perez currently stands in 32nd place.