Brown’s third album “Graffiti” sold 102,000 copies, well below the 150,000-175,000 units he was expected to sell. His last set, “Exclusive,” debuted at No. 4 in 2007 with 294,000.

The R&B star, looking to get his career back on track after he was convicted of beating up then-girlfriend Rihanna in February, took to his Twitter account during the weekend to accuse retailers of “blackballing” his album — a charge that anecdotal evidence suggested was unfounded. (Rihanna’s fourth album, “Rated R,” debuted at No. 4 earlier this month with a personal-best 181,000 copies, and is currently at No. 25).