Sydney forward Barry Hall was sensationally reported for striking as the Swans scored a 62-point win over an under-strength West Coast at ANZ Stadium.

The Swans dominated every quarter to win 16.11 (107) to 5.15 (45).

Former junior boxer Hall, a three-time All-Australian and one of the AFL's most intimidating figures, punched Eagles defender Brent Staker on the jaw at the 25-minute mark of the first quarter as the pair wrestled behind the play.

After regaining his feet, Staker watched the game from the bench wearing a tracksuit top and a dazed look.

The Swans (3-1) desperately need their six-time leading goalkicker Hall for next week's trip to Geelong to play the unbeaten defending premiers.

Hall was booed by West Coast fans after the incident and also had heated words with West Coast players at the quarter-time break.

In an eventful night, Hall accidentally smashed his hand into the fence on the outer wing late in the game and was taken off with what appeared to be a wrist injury.

The Swans outscored the Eagles four goals to one in each of the first two quarters to hold a 39-point advantage at halftime 8.6 (54) to 2.3 (15).

Sydney full forward Michael O'Loughlin (four goals) was in magical touch, kicking two goals in the opening quarter.

With Tadhg Kennelly providing a springboard from defence, the Swans got their running game going as Adam Goodes, Brett Kirk, Ryan O'Keefe and Jarrad McVeigh all contributed goals in the second quarter.

Ben McKinley (four goals) was West Coast's only goalscorer in the first half with two and followed up with a third after halftime.

But the Swans added another four in the third quarter to lead by 51 points at three-quarter time as O'Loughlin scored his third compliments of a delightful pass from dual Brownlow Medallist Goodes and added a fourth in the last quarter.

Matt Rosa (23 possessions, 11 marks) tried hard to lift the Eagles while leading midfielder Daniel Kerr (15 possessions) struggled to shake off the tag of Kieren Jack.

The Eagles went into the match without 2006 Norm Smith Medallist Andrew Embley (ill) and injured duo Matt Priddis and David Wirrpanda.

Sydney and West Coast had a proud history before Saturday night of close finishes, with the 2005 and 2006 grand finals both decided by less than a goal.

In six of the past seven meetings between the two sides, the margin had been an amazing four points or less.

Swans coach Paul Roos said Hall was likely to miss several weeks with a suspected broken wrist, regardless of any possible suspension.

Roos, who coaches from the boundary line in the dugout this season with John Longmire calling the shots from the coaches' box upstairs, said he didn't see Hall's clash with Staker.

"I didn't get to see that part of it. But I think he's going to be out anyway," Roos said.

"Being down on the bench, I can't get to see the replay.

"But I don't think he'll be playing too much for the next however many weeks anyway. I think he might have broken his wrist.

"That's the early diagnosis. I haven't really got an update since the end of the game."

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