Duursma set to miss three weeks
A hamstring injury to Xavier Duursma was the only sour point for Port Adelaide, in their 29-point success against Fremantle.
The 19-year-old looks set to miss at least three weeks, after hurting himself during a kick in the third quarter.
Duursma required the assistance of trainers to get off the ground.
But coach Ken Hinkley is not expecting it to be a severe injury.
"He's got a little history with hamstrings but they're only very minor normally with 'Xav'," said Hinkley.
"I imagine we'll get a scan that says he's got a hamstring injury that's probably going to be three weeks."
The victory was the Power's third in a row since the start of the campaign, and they lead the way as the only team with a perfect record through the opening three rounds.
Ruckman Scott Lycett was proud of the performance of his side's big men in the forward line.
Tall forwards Charlie Dixon, Justin Westhoff and Todd Marshall combined for 14 marks and five goals between them despite the torrential rain at times during the game.
Lycett said: "Obviously, not a night for big guys and we just wanted them to make a contest and that's all we can ask for, even in dry conditions.
"For them to actually take some marks in the wet and kick some goals goes a long way to us winning and I'm just really proud of them because I can see what everyone doesn't see at training and the work that they put in."
Port Adelaide are 13/2 to win the Grand Final.
The Power are 14/25 to win their next game against West Coast, who are 6/4.
View all Australian Rules betting