Fast National ratings for Thursday, July 9, 2010.

Viewers welcomed "Big Brother" back to CBS with open arms, as FOX and CBS split Thursday night.

Among adults 18-49, FOX averaged a 2.1 rating to nip the 1.9 rating for CBS. NBC's 1.1 rating was third in the key demographic, followed by the 0.8 rating for ABC and The CW's 0.5 rating.

Overall, though, CBS averaged an estimated 7.53 million viewers to go with a 5.0 rating/9 share, topping FOX's 4.2/8 for the night. NBC was a distant third overall with a 2.1/4, bettering the 2.0/4 for ABC and The CW's 0.9/2.

In the 8 p.m. hour, the season premiere of the 11th installment of "Big Brother" averaged a 4.4/8 and 6.68 million viewers to go with a 2.3 demo rating, all tops for the hour. FOX was second with a 3.6/7 for "Bones." ABC's two new episodes of "Samantha Who?" took third with a 2.5/5, just ahead of the totals for NBC's "30 Rock" and "The Office." The CW's "Smallville" trailed.

CBS stayed in first overall at 9 p.m. with a 5.1/9 for "CSI: Crime Scene Investigation." FOX's "So You Think You Can Dance" had a 4.8/9, but averaged more viewers than CBS' procedural and posted a 2.8 demo rating, the night's highest. ABC's "Grey's Anatomy" and NBC's comedies tied for third, beating the 0.8/1 for "Supernatural" on The CW.

"The Mentalist" closed the night in first for CBS with a 5.5/10. NBC's "The Listener" took second with a 2.3/4, beating ABC's "Private Practice."

 

All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.