A few days after AFL legend and Lions coach Leigh Matthews called for an end to betting on games, a leviathan punter has weighed in with a massive $100,000 wager on Geelong to smash struggling Melbourne this weekend.

Sportingbet Australia snapped up the six figure bet at $1.04 and have challenged heavyweight punters to continue unloading on what look to be the biggest certainties and hottest favourites to go around for some years.

Matthews this week called on the AFL - which has major sponsorships with two prominent betting outlets - to wash its hands of gambling because of suspicions about close results and the innuendo it creates for the game and those involved.

While Geelong look "past the post" on form, major upsets can and do happen in sport.

Two years ago Richmond pulled off a stunning boilover, upsetting Adelaide when the Crows were rated good things at $1.10 favourites.

Adelaide were coming off a nine goal hammering of the Kangaroos while Richmond were licking their wounds after being thrashed by 20 goals by a rampant Sydney Swans.

Richmond employed high possession tactics, something new Melbourne coach Dean Bailey has promised won't happen this weekend, in the three point upset in 2006.

"No side deserves to be $1.04 in round three," said Sportingbet Australia's AFL manager Steve Fletcher.

"We saw Richmond pull off a big upset a few years ago and Carlton went within a kick of stunning the West Coast last year.

"Stranger things happen and if a hot pot is going to go down, we want to be sure we have plenty of the action."

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