following the release of the singles "rockferry" (2007) and "mercy" (2008), the latter reaching singles charts worldwide, duffy released her debut album "rockferry" in 2008. the album entered the uk album chart at number one, and became the best-selling album in the united kingdom that year, with 1.68 million copies sold. the album was certified several times platinum and sold over 7 million copies worldwide, spawning further successful singles. with "mercy", duffy became the first welsh woman to achieve number one on the uk singles chart since 1983, while "rockferry" was awarded the grammy award for best pop vocal album amongst further nominations at the 51st grammy awards. in 2009, she won three brit awards for british breakthrough, best british female and best british album.