Collingwood has kept Sydney goalless for three quarters, emphatically ending the Swans' perfect start to the AFLW season with a shock 26-point win.

Kalinda Howarth kicked 3.3 and midfielders Sarah Rowe and Brittany Bonnici also starred on Saturday as the Magpies dominated 6.7 (43) to 2.5 (17).

Port Adelaide added to the day of upsets, knocking off another unbeaten side Melbourne at Alberton Oval, while Carlton had a thumping win over Gold Coast by 46 points.

Compounding the bad day for Sydney, Lexi Hamilton was in distress after a blow to her chest in a marking contest, forcing her from the field in the third term.

Then Irish recruit Julia O'Sullivan also went off when she landed awkwardly in the final quarter and her left knee buckled.

The Swans started the game as hot favourites, on

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