Fast National ratings for Wednesday, August 21, 2013.
Wednesday night played out according to recent form: "America's Got Talent" helped NBC easily win the night overall, while "MasterChef" gave FOX a relatively easy win among young viewers. 
Among adults 18-49, FOX averaged a 1.7 rating for Wednesday night, beating the 1.4 ratings for both CBS and NBC in the key demographic. There was a drop to ABC's 0.8 key demo rating and to the 0.3 key demo rating for The CW.
Overall, though, NBC averaged an estimated 6.15 million viewers and a 3.9 rating/ 7 share for Wednesday, topping the 3.6/6 and 5.48 million viewers for CBS. FOX was third with a 2.6/4 and 4.18 million viewers, with ABC's 2.1/4 and 3.12 million viewers right behind. The CW averaged 1.095 million viewers and a 0.8/1 for the night.
[Univision averaged 3.48 million viewers and a 1.3 rating among adults 18-49 for Wednesday night.]

8 p.m. - "Big Brother" started primetime in first for CBS with 6.31 million viewers and a 2.2 rating among adults 18-49, rising from last week's Wednesday show. NBC's "America's Got Talent" encore was second with 5.83 million viewers and a 1.3 key demo rating. ABC's "The Middle" and "Last Man Standing" repeats averaged 3.59 million viewers and a 0.8 key demo rating, compared to the 2.9 million viewers and 1.1 key demo rating for FOX's "MasterChef" encore. The CW's repeat of "Arrow" averaged 1.3 million viewers and a 0.4 key demo rating.
9 p.m. - "America's Got Talent" led the 9 p.m. hour overall for NBC with 9.18 million viewers, but stayed second with a 2.1 rating among adults 18-49. FOX's "MasterChef" was second with 5.46 million viewers and won the hour with a 2.3 key demo rating, expanding its key demo margin-of-victory from last week. CBS' "Criminal Minds" repeat was third with 4.41 million viewers and a 0.9 key demo rating, beating the 2.86 million viewers and 0.8 key demo rating for ABC's repeats of "Modern Family" and "The Neighbors." The CW's "Supernatural" repeat averaged 891,000 viewers and a 0.2 key demo rating.
10 p.m. - A repeat of "CSI: Crime Scene Investigation" averaged 5.68 million viewers and a 1.1 key demo rating to win the 10 p.m. hour for CBS. NBC's "Camp" dropped from last week but finished second with 3.44 million viewers and a 0.9 key demo rating. ABC's "The Lookout" averaged 2.9 million viewers and a 0.7 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.
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.