Fast National ratings for Sunday, March 21, 2010.
 
An NCAA Tournament overtime thriller carried nearly an hour into primetime and gave CBS a big bump and an easy victory on Sunday night.
 
Of course, all numbers are subject to change.
 
Among adults 18-49, CBS averaged a 3.7 rating, far ahead of the 2.1 rating for both FOX and ABC. NBC's 1.9 rating was a close fourth in the key demographic.
 
Overall, CBS averaged an estimated 13.19 million viewers to go with an 8.0 rating/13 share. ABC was a distant second with a 4.6/7, beating the 3.4/6 for NBC. FOX's 2.7/4 trailed.
 
CBS started the night in first with an 8.5/15 for what was 50 minutes of NCAA tournament coverage and the start of "60 Minutes" in most of the country. ABC's "Thin Ice" was second with a 2.9/5. NBC's "Dateline" was third, beating the 1.9/3 for two episodes of "'Til Death" on FOX.
 
In the 8 p.m. hour, CBS got a 7.9/13 from "60 Minutes" and "The Amazing Race." ABC's "Extreme Makeover: Home Edition" was second. FOX's "The Simpsons" and "The Cleveland Show" averaged a 3.1/5 overall and finished second in the key demo. NBC's "Minute to Win It" was fourth with a 2.9/5. 
 
CBS stayed in first at 9 p.m. with "The Amazing Race" and the start of "Undercover Boss," which had a 7.3/11. ABC's "Desperate Housewives" was a close second with a 6.8/10.NBC's "Celebrity Apprentice" was third. FOX's "Family Guy" (3.9/6) and "Sons of Tucson" (2.4/4) were fourth.
 
"Undercover Boss" and the start of "Cold Case" gave CBS an 8.2/14 in the 10 p.m. hour. NBC's "Celebrity Apprentice" improved to a 4.6/8. ABC's "Jamie Oliver's Food Revolution" was third with a 4.1/7 in its series premiere.
 
 
All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change, particularly in the case of live events.
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.