The X Factor final is too close to call, according to bookies.
Girl group Little Mix are narrowly ahead and could make X Factor history if they become the first group to win the hit ITV1 talent show.
But bookies are reporting a flurry of bets on Marcus Collins, who could cash in on the popularity of his mentor, Gary Barlow, when they perform a duet tomorrow night.
William Hill cut the odds on the young Liverpudlian from 5/2 to 2/1 when it was confirmed that all the acts would duet with their mentors at Wembley Arena.
Spokesman Rupert Adams said: “The duet has played into Marcus’s hands – he now has the momentum and it would be no great surprise if he goes on to win this.”
The bookmakers put Little Mix at 5/4 to win, while comeback kid Amelia Lily is 5/2.
Even the show’s host, Dermot O’Leary, admitted it is impossible to pick a winner.
He said: “It’s my first year when we’re going into the final and we don’t really know who the favourite is.”
One act will be kicked off the show tomorrow, leaving the final two to fight it out on Sunday, but all three acts have already recorded a version of the same song, widely expected to be a cover of Damian Rice’s Cannonball, due to be released by the winner in time for Christmas.
This year’s X Factor has seen falling ratings and a series of incidents, including rumoured rows between judges Kelly Rowland and Tulisa Contostavlos and wannabe pop star Frankie Cocozza’s reported drug use, which saw him booted off the show.