The NRL competition has been turned on its head following of weekend of upsets highlighted by losses for 2004 grand finalists the Sydney Roosters and the Bulldogs.

The bizarre results prompted Cronulla captain Brett Kimmorley to declare there were no easybeats in the NRL.

Anyone who said pre-season that the Brisbane, the 'Dogs, Penrith, Newcastle and St George Illawarra would be in the bottom half of the ladder after four rounds would have had their sanity questioned.

But that's the scenario, with Canberra, Manly, Melbourne and North Queensland leading the way after a crazy weekend of football in which a massive 386 points were scored.

Leading bookmaker Centrebet installed the Cowboys as third favourite to win the competition behind the 'Dogs and Melbourne, which destroyed the Broncos by 46 points at home.

"It's the most open competition ever," said Centrebet's Gerard Daffy.

The Bulldogs were never in the hunt against an enthusiastic Sharks outfit at Toyota Park where they lost 26-12, with star forward Sonny Bill Williams leaving the field in the 28th minute when he aggravated an ankle injury.

Williams will have an MRI scan on Monday but should be fit for the Bulldogs' grand final re-match against the Roosters in round six following their bye this weekend.

"The easybeats are gone," said Kimmorley.

"It's a great challenge these days to get yourself mentally prepared for every week."

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