It paid off, as Aiello scored his first AHL goal just 36 seconds into overtime, on a give-and-go between him and Arcobello.
“It was just a great goal,” Nelson said. “Tonight was one of those games that was a bit hard on the ticker, but it was great to get the win.”
The Barons trailed 5-4 midway through the third period after the Griffins' Jamie Tardif scored his second power-play goal of the night.
But Oklahoma City answered less than a minute later. Hartikainen backhanded a rebound past Grand Rapids goaltender Jordan Pearce.
Aiello needed just 36 seconds to send the Barons to the win column.
The Barons scored a pair of power-play goals for the first time since Jan. 23.
Since that game, the Barons had gone just 6 of 75 with the man advantage.
Against Grand Rapids, they needed less than 1:30 in the second period to score on multiple power plays.