AFL updates: Collingwood defeats St Kilda, North Melbourne stuns Carlton, Sydney down Port Adelaide

Collingwood has won coming off the bye, overcoming a willing challenge from St Kilda at Docklands to extend their lead at the top to a game and a half.

The Magpies were challenged by the Saints for more than three quarters, before they kicked clear to win their 12th game of the season, 16.12…