The X Factor winner Shayne Ward looks set to claim this year's Christmas number one, say retailers.
X Factor winner Shayne Ward's single is That's My Goal
HMV said numerous customer enquires have contributed to a "massive" shipment of more than 700,000 of Ward's single to stores around the country.
The "biggest challenge" to his single That's My Goal, is from current number one Nizlopi's JCB Song, it said.
And Virgin predicted Shayne's song would sell "around 100,000 copies" on Wednesday, guaranteeing the top spot.
Mark Noonan, Trading Director of Virgin Megastores, added the record: "Could even rival, or beat, the Live 8 single - unprecedented sales for any artist".
"If this happens, Shayne will be the most successful reality TV artist ever - we're behind him 100%".
The retailer said it was dedicating the front of store to support the single and promote it nationally.
Other contenders for the top spot include See the Day by Girls Aloud and Eminem's When I'm Gone.
Ward, 21, won the ITV1 talent contest on Saturday, winning a £1m recording contract with impresario Simon Cowell's company.
HMV says the lost sales from the midweek release of The X Factor winner' single could give Nizlopi a "small" chance of remaining at the top for another week. Monday is the traditional day for single releases.
But HMV singles buyer Stewart Allan said the "huge momentum and massive publicity" surrounding Shayne made him the "firm favourite".
"At one point, a few weeks back, this looked a pretty open race, particularly with the absence of a major charity single, but once it was confirmed that there would be an X Factor single released in time for the Christmas chart, you always felt that all bets would be off," he said.
He said if just 2% of The X Factor's television audience of 9.2 million bought the single, it should be enough to give him the Christmas number one.
The retailer added that fellow Christmas challengers Westlife and Robbie Williams were both selling more strongly as albums and were unlikely to feature in the race for the festive top spot.
Bookmaker William Hill has already called Ward's single a certainty to reach number one for Christmas.
It has cut his odds of topping the charts from 1/7 to 1/9.