Lynn Williams netted two goals and Rose Lavelle tallied two assists on the way to the win.
It started out ugly for the Sounders, but they turned it around to win their second MLS Cup in style.
The trophy was there for the taking, but TFC came up short in a 3-1 loss to Seattle Sounders FC.
An announced crowd of 69,274 dressed in blue and green roared as the Sounders won MLS Cup 3-1.
A shot from Seattle’s Kelvin Leerdam defected off Toronto FC’s Justin Morrow.
North Carolina claimed its 22nd ACC title behind Alessia Russo’s game-winner in extra time.
TV information, lineups and more for the 3 p.m. ET championship at CenturyLink Field
The Seattle Sounders and Toronto FC will meet in the MLS Cup for the third time in four years at 3 p.m. ET Sunday afternoon.
Defender Walker Zimmerman says the Americans lacked “bite” in their last game against Canada.
Sunday’s MLS Cup between Toronto FC and the Seattle Sounders is being played a month earlier than in years past.