Katie Melua is poised to score her first ever number one in the singles charts with a charity track featuring the late Eva Cassidy.
According to midweek sales, What A Wonderful World is set to top the charts on Sunday, knocking Leona Lewis off the number one spot.
The single - in aid of the British Red Cross - is only available from supermarket Tesco, but is outselling the X Factor winner's Bleeding Love to give the UK its first new number one in almost two months.
Katie, who spent much of her childhood in Belfast, where she attended Dominician College, Fortwilliam, has always been a huge fan of Eva Cassidy's.
Although she has had number one success with albums in the past, this will be the first time that she has topped the singles charts.
While the song looks set to be number one this weekend, bookmakers Ladbrokes are making the Melua/Cassidy duet - a cover of the Louis Armstrong cover - 5/1 to be the Christmas number one.
However, the eventual winner of the X Factor remains the most likely to top the chart for Christmas - although a batch of Christmas oldies are set to have a go as well, including The Pogues' Fairytale of New York and Mariah Carey's All I Want For Christmas Is You.
Gennaro Castaldo, spokesman for HMV, said: "Unfortunately, the huge power of the X Factor has put off all the big name stars throwing their hats in the ring as they once used to - as they realise they're on to a hiding to nothing."