As the days go by, the sales forecast for Justin Timberlake’s “The 20/20 Experience” continues to grow at an alarming rate.

Industry sources are now projecting that the pop star’s album will sell over 800,000 copies by the end of the tracking week on Sunday, March 24. It will easily secure Timberlake his second No. 1 solo album on the Billboard 200. The new chart’s top 10 will be revealed on Wednesday, March 27.

“20/20,” released Tuesday, March 19, is Timberlake’s first album since 2006’s “FutureSex/LoveSounds.” With “20/20” on course for an 800,000-plus start, it will easily notch Timberlake’s best sales week ever, bypassing “FutureSex’s” debut of 684,000 (according to Nielsen SoundScan).

“20/20” will also instantly become the year’s top selling album, eclipsing Mumford & Sons’ “Babel,” which has sold 631,000 this year.

On March 11, before “20/20” had even come out, sources initially estimated that the RCA Records album was on track to move at least 500,000 in its debut week. As we reported then, that forecast was likely to grown larger once the album reached retailers. Suffice it to say: It did.

iTunes is reportedly leading the way in terms of sales of “20/20,” with Target blowing through its stock as well. The latter was the only retailer with an exclusive version of the album. Target’s deluxe CD edition includes two bonus songs unavailable anywhere else: “Dress On” and “Body Count.”

If “20/20” moves 800,000 or more, it will mark the largest sales week for an album by a male artist since 2010, when Lil Wayne’s “Tha Carter IV” shifted 964,000 when it debuted at No. 1 on the Billboard 200 dated Sept. 17. The last album, overall, to sell more than 750,000 was Taylor Swift’s “Red,” which blew in at No. 1 with 1.2 million on the Nov. 10, 2012 list. [billboard.biz]