His side's dream start set up a 55-point victory over Port Adelaide on Sunday, but Sydney's commitment in the final three quarters was what really impressed coach Paul Roos.

The Swans bolted out of the blocks booting the first seven majors of the contest to lead by 43 points at quarter-time.

And while the Power rallied bravely thereafter, the Swans were never seriously threatened on course to their fifth win of the campaign.

"Today was just one of those days where just everything seemed to come off and the players executed really, really well," Roos said.

"Throughout the whole day we put a lot of pressure on them and they weren't able to get free players anywhere and we were able to take our scoring chances."

"Our first quarter set it up, no doubt, but the fact that we were able to keep some distance ... and then finish off the game in the last five or 10 minutes and kick some late goals was good as well," he said.

"It was clearly the best we've played this year and I think we've played some good footy this year but it was the best four-quarter performance."

Asked to pluck the standout performers from an impressive bunch, Roos enthused: "Statistically we had some very, very good players I mean it's not often we have 405 possessions as a footy team."

"We had 11 midfield goal kickers, (Brett) Kirk had 32 (disposals) and two goals, (Jarrad) McVeigh had 26 and two goals, Jude (Bolton) had 29 and a goal."

"Our ruckman kicked four goals between them, Goodesy's (Adam Goodes) role was outstanding, so it was a really high level of performance from our players which obviously contributes to a very good win against a very good footy team."

Roos was equally pleased with the work of key forwards Barry Hall and Michael O'Loughlin.

"It's probably the best Hally's caught it, he took some really good contested marks and Mick, every time he goes near the ball he looks like he's going to make something happen and generally does," he said.

"They're in really good form together and they really complement each other."

But the usually reserved mentor left his highest praise for Heath Grundy's spectacular leaping mark midway through the second term.

"That was outstanding," Roos said.

"I don't know whether he wins a car or whatever but it's one of the best marks I've seen in 15 years I reckon - I was just unbelievable."