The A&M/Octone/Polydor track, which features Wiz Khalifa, hit 109,476 sales in its first week of release by the end of business on Thursday, according to the Official Charts Company, leaving it two more days to build on that number.
Its six-figure tally so far this week follows the Decca track Sing by Gary Barlow and the Commonwealth Band selling 142,470 downloads a fortnight ago to achieve the highest sales for a number one this year, only for Polydor's Call My Name by Cheryl Cole to beat that a week later after opening with 152,001 units.
Cole's single is now down to two on the midweeks, although she remains a contender to top the UK artist albums chart this weekend. Her Polydor set A Million Lights has been behind fellow new release Believe by Def Jam/Mercury's Justin Bieber all week and that remained the situation up until midnight on Thursday night.
RCA's Paloma Faith continues to benefit from her chat and performance on Graham Norton's BBC One show last Friday with sales of Fall To Grace up 37% on the week to lift it 5-3 in the midweeks. In its second week on sales Vertigo/Mercury's Amy Macdonald album Life In A Beautiful Light drops 2-4 at this stage of the week as Virgin act Emeli Sande's Our Version Of Events moves back up 6-5. Last Sunday's number one, the Decca-issued Sing by Gary Barlow and the Commonwealth Band, is down to six in the week so far.
In the singles market Warner Bros act Stooshe look like scoring a second top five hit with Black Heart showing up as a new entry at four, placing it between Atlantic act Flo Rida's Whistle (down 2-3) and the Parlophone track Princess Of China by Coldplay and Rihanna (down 4-5).
The full midweek singles and albums charts are on musicweek.com.