Debuting at No. 1 on Billboard's 'Top Rap Albums Chart' this week is Nas with his ninth solo album Untitled.

The set, which features appearances from Chris Brown, The Game and Busta Rhymes, scanned 187,000 discs in its opening week.

Lil Wayne loses the top spot and slips to No.2.  Tha Carter III shifted 105,400 discs this week, pushing its total to 1,912,000.

Entering the charts at No. 3 is David Banner with The Greatest Story Ever Told.  The album, which features appearances from Lil Wayne & Yung Joc, bags up 51,900 units in its first week spin.

G-Unit slips two spots to No. 4.  Terminate On Sight shelved off 21,200 discs this week, pushing its total to 159,300.

Posted at No. 5 is Florida rapper Plies. Definition Of Real continues its steady grind as it shells out 20,500 discs this week. After 6 weeks the album has sold a total of 400,700 copies.

Three 6 Mafia slides three spots to No. 6.  Last 2 Walk reels in 18,400 copies this week, pushing the album's total to 156,800.

Right behind them are The Flobots at No. 7.  10,700 f olks picked up Fight With Tools this week, bringing the album's total sales to 168,600.

Rick Ross holds it down at No. 8.  Trilla hustled 9,700 copies this week.  The album's tally stands at 629,600.

Houston duo ABN debut at No. 9 with their latest effort It Is What It Is.  The set sells 9,300 copies in its opening week.

Wrapping up the Top 10 is Kansas rapper Tech N9ne.  Killer cashed out 8,000 copies this week, bringing the album's total sales to 57,700.