West Coast's irresistible start to the AFL season continued at Subiaco Oval on Saturday night, remaining the league's only unbeaten team following a comprehensive 45-point win over Sydney.

With the Kangaroos losing to the Crows in Adelaide on Saturday, the Eagles are sitting pretty atop the AFL ladder with a perfect 6-0 record after a 15.14 (104) to 8.11 (59) victory over the undermanned Swans.

Starting the game without a recognised ruckman, Sydney enjoyed a four-point quarter-time lead, but from there it was all West Coast as the Swans (2-4) slumped to a third straight loss.

In-form Eagles skipper Ben Cousins led the way with 29 possessions and three goals, while Phil Matera (three goals) and Ashley Sampi (two) also kicked multiple majors in a balanced effort from the home side.

Rain fell throughout the contest and the conditions played a major part in a scrappy opening term that produced just two goals.

Cousins gave the home side the ideal start with a goal on the run inside the first minute, but the ladder-leaders only managed two more behinds for the term.

Sydney had plenty of the ball early on, but once again was unable to capitalise on the scoreboard.

Seven days after producing a woeful 7.18 return against Melbourne, the Swans finished quarter time with 1.6 for their efforts.

The rain became much heavier at the start of the second quarter, but it only served to inspire the home side.

Sampi put the Eagles ahead with a goal in the second minute of the term, sparking a run of six straight as West Coast opened a 33-point lead.

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