Sky Bet's punters appear to have lost faith in the British and Irish Lions since coach Warren Gatland made six changes to the side for the final Test with Australia.
The tourists went from 8/11 favourites to 11/10 outsiders when the side was announced in the early hours of Wednesday morning.
The biggest shock came in the centres as Gatland dropped former Lions skipper Brian O'Driscoll from the team to face the Wallabies in the series decider.
Gatland has instead put his faith in the Welsh - naming 10 players from the Valleys - and handing Alun-Wyn Jones the captain's armband. Jones has been backed into 12/1 from 16/1 last week to have an impact with a try in Sydney.
The Lions can take confidence from the fact that the Aussies have won just one of their last five games at the ANZ Stadium, however they have lost just nine of their previous 31 at this weekend's venue.
Once again, the battle on the wing between Israel Folau and George North takes centre stage with both men 10/1 joint favourites to open the scoring.
Jonathan Davies has been boosted to 20/1 to score the first try and the Welsh flyer has made more clean breaks than any other centre on the tour with five.
Sky Bet rugby union trader, Dave Sykes said: "All the support in the first two Tests was for the Lions, but the outright market has swung dramatically the Wallabies way.
"Our punters seem to have lost a little faith since Gatland announced the team for the decider with the Lions moving from 8/11 to 11/10."
As with the first two tests, the 'Winning Margin' markets have proven popular with customers.
A Lions victory between 1-12 points at 7/4 has been heavily backed early on - a margin the Lions have won by in three of their last four victories over the Australians.