If the industry projection of 500,000 first-week sales seemed light for Justin Timberlake’s much-anticipated comeback album “The 20/20 Experience,” it is because it was light.

Very light.

Now that opening day sales data is available, Billboard is revising the estimate, forecasting as many as 750,000 sold units for the opening week. And, based on current momentum levels, a total in the 800,000 ballpark is still possible.

Timberlake’s wildly successful “FutureSexLoveSounds” moved 684,000 copies in its first week, demonstrating the significance of the 750-800,000 estimate for “20/20.”

And if the projection holds, this will be the best-selling album year-to-date and the best-selling album by a male artist since 2010, when Lil Wayne’s “Tha Carter IV” moved just under a million copies in its first week.

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