Friday Primetime Results:

* At 9 p.m. ET, "Grimm" (1.6/5 in 18-49, 5.2 million viewers overall) maintained 100 percent of last week's 18-49 rating for the show's Friday night season debut, to rank #1 in the hour among ABC, CBS, NBC and Fox. "Grimm" was #1 or tied for #1 among those networks from 9-10 in adults and men 18-34; adults, men and women 18-49; and adults, men and women 25-54.

* "Grimm" matched its highest 18-49 rating for a Friday telecast since January 20.

* Keep in mind that last season, "Grimm" originals added an average 69 percent to these next-day "live plus same day" 18-49 ratings when Nielsen issued "live plus seven day" results and last week's telecast grew by 72 percent in "live plus three day" results (to a 2.72 from a 1.58).

* At 10 p.m. ET, "Dateline NBC" (1.3/4 in 18-49, 4.6 million viewers overall) ranked #1 among ABC, CBS and NBC in adults 18-49 and tied for #1 in adults 25-54. "Dateline" also finished #1 among those networks in women 25-54 and men and women 18-49. From its first half-hour to its second, "Dateline" grew by 17 percent in adults 18-49 (to a 1.4 rating from a 1.2), 19 percent in adults 25-54 (1.9 vs. 1.6) and 13 percent in total viewers (4.8 million vs. 4.3 million).

* "Dateline NBC" matched its top Friday 18-49 rating since June 1.

* In the 10:30 lead-in to local news, "Dateline NBC" delivered a 6 percent margin of victory in the key news demographic of adults 25-54 (with a 1.9 rating vs. a 1.8 for CBS's second-place "Blue Bloods"). "Dateline" was also #1 among ABC, CBS and NBC in the 10:30 half-hour in women 25-54 and adults, men and women 18-49.

* At 8 p.m. ET, an encore telecast of "The Voice" (0.9/3 in 18-49, 3.1 million viewers overall) matched NBC's top non-sports 18-49 rating in the time period since May 18 and delivered the networks biggest overall audience for non-sports programming in the hour since that same date.

In late-night metered-market households Friday night:

* In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.5/6; CBS's "Late Show with David Letterman," 2.5/6; and ABC's combo of "Nightline," 2.8/6; and "Jimmy Kimmel Live," 1.4/4.

* In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 0.8/4; "Late Show," 0.5/2; "Nightline," 0.9/4; and "Jimmy Kimmel Live," 0.5/3.

* At 12:35 a.m., "Late Night with Jimmy Fallon" (1.5/5 in metered-market households) beat CBS's "Late Late Show with Craig Ferguson" (1.1/4). In the 25 markets with Local People Meters, "Late Night" (0.6/4 in 18-49) topped "Late Late Show" (0.4/2).

* At 1:35 a.m., "Last Call with Carson Daly" averaged a 1.0/4 in metered-market households and a 0.4/3 in adults 18-49 in the 25 markets with local people meters.

NOTE: All ratings are "live plus same day" from Nielsen Media Research unless otherwise indicated.