Stanley hit a good drive, but his ball came to rest in a divot. His approach on the par-4 missed the green to the right, and his chip from high grass came up about 5 feet from the cup. Disappointed, he two-putted for his third bogey of the round.
That left Grube as the lone likely challenger. He was 7 under through 14 holes, but three pars and a finishing bogey left him third. The national title was a nice consolation prize, he said, and one the team set as its goal before the season.
"There's probably only about seven people that thought that was a possibility, but that's fortunately all you need," he said after a closing 71 for a 6-under 274 total.
The victory was a nice cap to the season for Lovemark, who plans to leave Sunday for the Palmer Cup that pits amateurs from the United States against Europeans.
"It means a lot," Lovemark said of the victory. "It means I've improved a lot during the course of the year and during the course of the last couple of years."
But, he said, it doesn't make him think of turning pro.
"I still know I have a long ways to go," he said.
Stanley was disappointed to have finished so poorly after starting the day with a share of the lead. He, Grube and Georgia Tech's Cameron Tringale were all 6 under.
"After the front nine, I was in pretty good shape," said Stanley, who made the turn at 4-under but finished with a 69. "I just didn't play that well on the back."