Troy survived a final-play pass into the end zone to cap a 37-31 victory at Southern Miss on Saturday.
USM had the ball at the Troy 9-yard line with 3 seconds left. After a timeout, quarterback Nick Mullens' throw to Isaiah Jones fell incomplete.
Jordan Chunn ran for 176 yards, Brandon Silvers threw for three touchdowns and Ryan Kay kicked three field goals for the Trojans (2-1), who celebrated a rare non-conference road victory.
Troy has just four non-conference road wins since joining the Sun Belt Conference in 2004. The most recent was 2012 at UAB.