At Belfast, Kasey McLeod scored a second-half goal for Belfast that tied the game at 2-2 and sent it into the two scoreless overtime periods.
Gardiner took a 2-1 lead into the half on a pair of goals from Morgan Carver, one was unassisted and one was assisted by Lauren Slade.
Belfast’s goal, scored by Alexis Racciopi and assisted by Ashley Littlefield, came in between the two Tiger goals.
Grace Davis made 6 saves and on 9 Gardiner shots for Belfast while Ally Day made 5 saves on 11 for Gardiner.
The Tigers had a 9-5 advantage in corner kicks.