Jason Horne-Francis hobbles off the field in Port's 97-point loss to Sydney, as Geelong makes light work of Essendon.
In Saturday's final match, Adelaide hosts Richmond at the Adelaide Oval.
Earlier on Saturday, a huge final quarter from Harry Petty helped Melbourne claim a four-point win over the AFL's ladder-leaders Fremantle.
Petty kicked 3.2 for the afternoon, including two in the final quarter as Melbourne emerged 17.11 (113) to 17.7 (109) winners in one of the games of the season at the MCG.
Prior to the action on Saturday, AFL boss Andrew Dillon addressed Geelong's concussion saga, ending a couple of days of silence from the league.
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This is a different looking Crows at the start of the term.
A clearing kick was picked off on the bounce by Adelaide, and Jordan Dawson and Alex Neal-Bullen were involved as they sent it back inside 50 for Brayden Cook to mark cleanly in the left forward pocket.
He converts the set shot, and there are the cheers from the relieved Crows fans as the lead gets out to seven points.
They shifted forward inside the first minute of the second term, and Isaac Cumming ended up kicking the goal after about 47 seconds.
The siren sounds, and the Crows crowd lets the team know of their lack of satisfaction.
It gets worse as Mykelti Lefau nails a kick from the pocket after the siren in the wet.
The Tigers lead by five points at Adelaide Oval, and you couldn't say it was too much of a shock. At worst they have been right in it, and it hasn't looked like a matchup of 17th versus a potential top-four side.
Matthew Nicks will no doubt have something to say at quarter time, because Adelaide needs to improve and quickly.Â
Well, those radar images must have been on delay, or else someone pressed the accelerator because the rain has arrived at Adelaide Oval.
