Merciless Collingwood dished out Port Adelaide's largest AFL defeat with a 138-point trouncing on Saturday night.

The Magpies won 23.21 (159) to 3.3 (21) with Port's meagre total their lowest score since joining the competition.

Collingwood's attacking livewire Jarryd Blair revelled in wet conditions with an influential four-goal display, while key forward Travis Cloke and prolific ball winner Dane Swan both booted three.

On the same day Geelong again flexed their collective muscle, pacesetter Collingwood weren't to be outdone and ruthlessly dismantled last-placed Port.

The Magpies comfortably eclipsed their previous highest winning margin over Port of 79 points in the Power's first AFL game in 1997.

Port's total score was less than their past lowest of 3.12 (30) against Richmond last year and the margin was the Power's heaviest defeat, worse than their 119-point loss to Geelong in the 2007 grand final.

Port's supposed rallying for club legend Chad Cornes' final match fell alarmingly flat.

The Power didn't score a goal until the 30th minute of the second quarter - by that time, Collingwood had potted a dozen.

Blair and fellow small Dayne Beams started the rot for Port with a dominant opening term as the visitors raced to a 6.5 to 0.1 lead at quarter-time.

The opening blitz set the tone of an amazingly lopsided encounter in which Magpie utility Leigh Brown, Dale Thomas, Swan and elusive forward Andrew Krakouer (two goals) all featured prominently.

By halftime, Collingwood had defied heavy rain to romp to a 76-point advantage - and of Port's 1.2 scoreline at the main break, the two behinds were rushed.

The utter domination continued in the second half despite Port's Mitch Banner kicking two goals for the half as Collingwood marked the 250-game milestone of defender Chris Tarrant in style.

Collingwood coach Michael Malthouse said his side took no great pleasure from the record mauling of Port.

"The pleasing thing is we were able to play four quarters of football against a side that had multiple injuries," he said.

"There was no suggestion of rubbing their noses in it or trying to humiliate them, it was simply just go about your role and play football the way we expect to play at Collingwood." Port Adelaide half-back Jaspar Pittard tore a hamstring, adding the injury-enforced withdrawal of four other senior players before the match.

Power coach Matthew Primus remains cemented on the bottom of the ladder with just two wins.

"It looked like boys against men the whole night," Primus said.

"As stupid as it might sound, I thought the effort was okay."

"... How we wanted to play just was not there."

Primus said rebounding defender Hamish Hartlett, one of few bright spots in Port's bleak year, would be sent for season-ending shoulder surgery next week.

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