In a diva duel atop the U.S. album chart, Adele’s “21″ nudged aside Lady Gaga’s “Born This Way” to retake No. 1 for a 10th nonconsecutive week.The week’s big winner was the original cast album of “The Book of Mormon,” which reached the top five on the heels of the show’s nine Tony Award wins Sunday. Still riding the chart-topping success of the single “Rolling in the Deep,” “21″ (Columbia) moved back to the top with sales of 114,000 units, according to Nielsen SoundScan data for the week ended Sunday. While Adele’s sales are off 5%, Lady Gaga’s plunged 42% more, as the fast-fading “Born” (Interscope) lost one position to No. 2 with 100,000 sold in just its third week on the chart. That number is less than 10% of the album’s first-week tally of 1.1 million. “Mormon” — drawn from the show penned by Trey Parker, Matt Stone and Robert Lopez — vaulted to No. 3 with a 61,000-unit week. Cast album, which benefited from a $1.99 pre-Tonys sale on Amazon, just reached stores as a CD last week after bowing as a digital-only release in May. Its previous peak came three weeks ago, when it bowed at No. 31 with 13,000 sold. It was the first Broadway set to register in the top 10 since “Hair” soared to No. 1 in 1969. Tech N9ne’s “All 6′s and 7′s” (Strange) debuted at No. 4 with 56,000 shifted out of the box. It was the rapper’s highest-charting set, besting the No. 12 peak of his 2008 set “Killer.” Now a solo act following the dissolution of Brooks & Dunn, longtime country star Ronnie Dunn bowed at No. 5 with his self-titled Sony Nashville collection, which moved 45,000 units in its first week. Week’s other debutante collection was All Time Low’s “Dirty Work” (Hopeless), which came aboard at No. 6 with 44,000 sold. Rest of the top 10 was made up of holdover titles: Jason Aldean’s “My Kind of Party” (No. 7, 41,000 sold, up 23%), Brad Paisley’s “This Is Country Music” (No. 8, 38,000, off 29%), the “Now 38″ comp (No. 9, 31,000, down 20%) and Death Cab for Cutie’s “Codes and Keys” (No. 10, 30,000, off 71%). The coming week’s big chart debuts should include Eminem’s side project Bad Meets Evil and the major-label full-length bow of moppet star Jackie Evancho.