Avicii's Wake Me Up has already sold another 100,000 copies in the UK this week after debuting at No 1 last Sunday with 2013's highest sales figures.
The Positiva/PRMD single is a certainty to top the chart again this weekend having shifted a further 107,492 copies by the end of business on Thursday, according to the Official Charts Company. That gives it a lead of nearly 50,000 units over its closest rival, One Direction's newly-issued Syco single Best Song Ever.
Wake Me Up sold 266,528 copies last week, the highest tally so far this year, while its cumulative UK total is on course to be above 400,000 by the end of this week just a fortnight after being released.
Below Avicii and One Direction, the rest of the Top 10 rehsuffle around in the week to date, including Interscope/Polydor act Robin Thicke's Blurred Lines with TI and Pharrell Williams falling 2-3, Island act John Newman's Love Me Again down 3-4 and Icona Pop's Atlantic single I Love It with Charli XCX down 4-5.
The newly-issued Now! 85's sales are already up to 220,828 this week, almost as many as what the Top 100 artist albums have managed combined over the same timeframe. Issued by Universal and its new Now! partner Sony, it appears on course to beat the first-week sales of the equivalent 2012 album, Now! 82, which started with 267,618 takers.
Managing little more than one-seventeenth of Now! 85's sales is X Factor 2012 runner-up Jahmene Douglas's RCA debut Lover Never Fails, which currently leads midweek artist albums. Robin Thicke's Interscope/Polydor set Blurred Lines drops 1-2, the Roc Nation/Virgin EMI-issued Magna Carta Holy Grail by Jay Z is down 2-3, Nettwerk's Passenger is up 5-4 with All The Little lights and Rod Stewart eases 4-5 with his Capitol/Decca set Time.
The full midweek singles and albums charts are on musicweek.com.