Points, an overnight co-leader, finished 54 holes at 11-under 199 for a two-shot lead at Elmhurst Country Club.
Brendon De Jonge, who won last week's Xerox Classic, fired a 7-under 63 and vaulted up from a tie for 36th into a tie for second place. Greg Chalmers, who was tied for the midway lead, posted a 1-under 69 to join De Jonge at 9-under 201.
Points wasted little time in breaking out of the tie atop the leaderboard. He birdied the first hole, then birdied No. 4, but Chalmers kept pace thanks to back-to-back birdies at three and four.
Both Points and Chalmers birdied the seventh, but Chalmers moved in front with a birdie at eight. Points tied Chalmers once again after a birdie at the 11, then the 12th became a crucial hole.
Points birdied the hole in the group ahead of Chalmers to briefly take a one- stroke lead. Chalmers bogeyed to fall two, but another Chalmers bogey at 13 gave Points a three-stroke lead.
Points was not immune from mistakes. He bogeyed the 14th hole, but didn't lose anything off his cushion. Chalmers bogeyed 15 to fall into a tie for second with De Jonge, who was in the clubhouse at that point.
Points cruised through his next three holes and held his three-shot lead. He missed the green at 18 and made bogey, giving him a two-stroke advantage with one round to play.
If Points can hold on Sunday, it would be his fourth Nationwide Tour victory and his first since a two-win season in 2004, which included a win at this event. He sits 35th on the money list, so a good finish could get him into that top 25, where players get their PGA TOUR cards for next year.
Rich Barcelo (66), Chris Nallen (67), Jeff Curl (68), Bubba Dickerson (67) and Chris Kirk (68) are knotted in fourth place at 8-under 202.