Sydney has pulled off a superb second-half fightback to dismantle Fremantle by 17 points at Optus Stadium.

After falling 23 points behind in the first half, the Swans adjusted and picked apart the Dockers' famed defence, winning 11.16 (82) to 9.11 (65), with the home side losing just their third game at home this season after the Swans turned the match on its head with a focus on controlling possession and taking uncontested marks.

The win was built on a patient game style that frustrated the Dockers and took the ball out of their hands in the second half, with the Swans racking up a massive 127 uncontested marks to the Dockers' 70.   

John Longmire's team took 88 uncontested grabs to 30 in the second half and turned a 23-point deficit into an important 17-point win that gets them back in the top-four hunt.

Swans coach Longmire said the win was "terrific" and praised his players for driving the game style adjustment after half-time.

"It just took shape during the course of the game. You have to find different ways to play, but that is off the back of pressure and structure and effort," he said.

"It was off the back of strong defence. Make sure we maintain defensive work and then add to that. Our players adjusted well in the second half, so full credit to them."

Longmire said the Swans would not look ahead to a potential top-four finish after strengthening their position with back-to-back wins, with their ladder position "not relevant".

"We've been up and down a bit this year, in games and week to week. We need a bit of consistency," he said. 

Watch the full post match press conference with John Longmire below.