Abilene Christian (6-6, 4-4 Southland Conference) closed out its first season in the conference with a victory.
The Lumberjacks (7-4, 4-3) had a chance to win it, but Jordan Wiggs drove a 27-yard field goal attempt wide left with 1:19 remaining.
Wiggs, who is SFA's all-time point leader, has made 72.9% of his field goal attempts.
Grau had a 35-yarder in the first quarter and booted a 26-yard field goal at the end of the first half to give ACU a 26-21 lead.
Gus Johnson, who rushed for 158 yards, scored from the 31 early in the fourth to give SFA a 35-34 lead.