Fast National ratings for Friday, March 16, 2012.
 
CBS' NCAA Tournament coverage -- including Lehigh's thrilling upset win over Duke -- won Friday night easily, delivering a smaller overall number than the network is accustomed to, but a better number among young viewers.
 
Among adults 18-49, CBS averaged a 2.2 rating, beating ABC's 1.5 rating in the key demographic. FOX averaged a 1.1 rating, beating the 0.8 rating for NBC and The CW's 0.6 rating.
 
Overall, CBS averaged 6.2 million viewers and a 3.9 rating/7 share, which edged out ABC's 3.8/7 and 5.76 million viewers. NBC was third with a 2.8/7 and 4.08 million viewers, better than FOX's 1.8/3 and 2.64 million viewers. The CW's 1.61 million viewers and 1.0/2 trailed.
 
8 p.m. - ABC won the 8 p.m. hour overall with the 6.09 million viewers for "Shark Tank," which finished second with a 1.7 rating among adults 18-49. CBS' NCAA hoops coverage was second overall with 5.36 million viewers and won the hour with a 1.8 key demo rating. NBC's "Who Do You Think You Are?" averaged 4.24 million viewers for third and a 0.7 key demo rating for fourth. The CW's "Nikita" averaged 1.53 million viewers and a 0.5 key demo rating.
 
9 p.m. - With the big upset pending, CBS' basketball coverage leapt to 8.375 million viewers and a 2.9 rating among adults 18-49. ABC was second with 5.57 million viewers and a 1.5 key demo rating for "Primetime: What Would You Do?" A repeat of "Grimm" averaged 3.39 million viewers and a 0.7 key demo rating for NBC compared to FOX's 2.65 million viewers and a 1.1 key demo rating for a "Kitchen Nightmares" repeat. The CW's new "Supernatural" averaged 1.69 million viewers and a 0.7 key demo rating.
 
10 p.m. - ABC moved back into first overall for the 10 p.m. hour with 5.62 million viewers for "20/20," which was second with a 1.4 rating among adults 18-49. CBS' basketball averaged 4.86 million viewers and won the hour with a 1.8 key demo rating. NBC's "Dateline" was third with 4.6 million viewers and a 1.0 key demo rating.
 
All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.
 
Dan-feinberg-med
A long-time member of the TCA Board and a longer-time blogger of "American Idol," Dan Fienberg writes about TV, except for when he writes about movies or sometimes writes about the Red Sox. But never music. He would sound stupid talking about music.