Newcomer Duffy dominated this week's singles chart, shooting straight to the top with Mercy.

The 23-year-old Welsh newcomer came second in the BBC's Sound of 2008 poll of music critics' and broadcasters' favourite artists in January and has been compared to the 60s singer Dusty Springfield.

The Welsh singer-songwriter, whose full name is Amy Duffy, knocked Swedish DJ Basshunter off the top of the charts to claim the number one spot.

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Songbird: Welsh singer Amy Duffy has topped the charts with the release of her first single Mercy today

Nickelback held onto to number two with Rockstar and British singer David Jordan's Sun Goes Down climbed one place, to number four.

Meanwhile Adele and Rihanna, last week's three and four, both dropped two places.

And Adele's fall in the singles chart was matched by a fall in the album charts - the soulful London teenager saw her debut offering 19 also drop two places to number four.

But acoustic singer-songwriter Jack Johnson held onto the top spot for a second week running with his album Sleep Through The Static.

The Hawaiian-born musician's latest offering held off Nickelback's All The Right Reasons, which rose one place to number two.

New entrants this week included Michael Jackson, who burst into the album chart at number three with Thriller 25, and the British singer and lyricist Morrissey, whose Greatest Hits album debuted at number five.

Canadian crooner Michael Buble jumped from number 13 to number six, while Amy MacDonald also rose up the charts to from number nine to number seven with This Is The Life.