Cole Zierden gave the Otters the early lead with Isaac Young earning an assist. A goal by Elbridge DeKraai tied the game at 1-1 with assists going to Devin Sankey and Jason Malmgren.
Willmar took a 2-1 lead on an unassisted goal by Jack Michelson in the second period, but Zierden’s second goal of the night, setup by Michael DeBrito pulled the Otters even at 2-2. Isaac Johnson put the Otters ahead 3-2 with a goal assisted by Carter Thielke and Andrew Johnson.
In the third period, Ethan Stark scored from Sankey and Taton Hansen, tying the game at 3-3 and setting up Peterson’s game winner in OT.
Fergus Falls held a 40-33 advantage in shots on goal. Ben Swanson turned aside 30 shots in the Otter net.
Fergus Falls has a matinee game at two o’clock Saturday in Red Wing.