After Mike Fisher tied it for Nashville at 11:26 of the second period, Anaheim scored the final three goals.
Thompson gave the Ducks a 2-1 lead at 17:04 on a shot from below the right faceoff circle. Forward Rickard Rakell made a cross-ice pass to Thompson, who was able to wait out Predators goaltender Pekka Rinne and shoot it past him for his second goal of the series.
"Well, first off, [Getzlaf] had a great change," Thompson said. "He changed at the right time. When he changed, I sprinted on the ice and there was some open ice there. [Rakell] saw me, and I just kind of held on to it for a second. I saw an opening and put it in."
McGinn put the Ducks ahead by two goals when he scored with 1:04 left in the second on a redirection from the slot. The Predators failed to get the puck out of the defensive zone, and Ducks forward Chris Stewart corralled it and passed to McGinn, who got it past Rinne for his second goal.
"We were just thinking stay calm, stay the course," Thompson said "They were at home. They're going to make a push. They did that. They scored a big goal. We just kept our composure. We knew that we had to stick with it and push back, and we did that. We had some timely goals."