Adele set for top spot and fastest selling single with Hello
Adele's comeback single is on course to be the fastest-selling single of 2015.
Hello, the first track from the Oscar-winning singer's upcoming new album 25, is also on track to see her reign triumphant in the UK singles charts, shifting more than 165,000 in combined sales and streams since it was released on Friday - including 156,000 UK downloads, according to early figures obtained by the Official Charts Company.
Ellie Goulding currently holds the record for the biggest opening sales of the year, with Love Me Like You Do selling 173,000 in combined sales and streams in its week of release. The song, which featured in the Fifty Shades Of Grey soundtrack, was released in January.
Martin Talbot, chief executive of the Official Charts Company, said: "What an explosive return for Adele. It is a huge challenge for any artist returning after such a huge last record - as 21 and its singles were.
"But Adele has smashed it right out of the park with a fantastic single, which has connected with British music fans comprehensively. She already looks set to be the queen of quarter four."
Hello, written by Adele and Greg Kurstin, would be the 27-year-old star's second Number One single, following Someone Like You in 2011.
Justin Bieber's new single Sorry is tipped for second place, followed by Sam Smith's James Bond theme, Writing's On The Wall in the third spot. KDA and Drake round out the top five.
Meanwhile, Australian pop band 5 Seconds Of Summer are headed for their first UK Number One album with their second full-length record, Sounds Good Feels Good.
It follows the group's self-titled debut, which peaked at Number 2 upon its release in 2014.
Other music artists who are expected to make welcome returns to the UK charts include Canadian singer Bryan Adams, former Beautiful South bandmates Paul Heaton and Jacqui Abbott, Italian tenor Andrea Bocelli and Irish singer - and former Strictly Come Dancing contestant - Daniel O'Donnell.