Mate Ma'a Tonga became the first second tier nation to defeat a tier one side, with a 28-22 win sealing top spot in the group.
Last week's shock 28-22 victory over the Kiwis saw Tonga finish ahead of New Zealand, setting up a clash with Lebanon for a spot in the tournament semi-finals.
Speaking to media versatile back, David Fusitu'a spoke about the intensity of the match.
"It was crazy, I know the boys really enjoyed it," he said.
"The effort the boys put in there... they did it for each other, it really showed out there."
"We did it for our families."
Fusitu'a says that Tonga are in great spirits ahead of the knockout clash.
"It's been great, we're enjoying each other's company during the week and during training," he said.
"There's a good spirit in the team."
"When we're off the field there's always good laughs, but when we're on the field - it's business."