Tuesday Results:

NBC is #1 for the night, winning six of six half-hours among ABC, CBS, NBC and Fox in adults 18-49, and topping the night's #2 network, CBS, by a 36 percent margin (3.0 vs. 2.2).

* From 8-10:01 p.m. ET, "The Voice" (3.6/10 in 18-49, 11.1 million viewers overall) delivered the #1 18-49 rating of the night on ABC, CBS, NBC and Fox, by a 24 percent margin versus the #2 show on those networks, "NCIS" (2.9 from 8-9 p.m.). "The Voice" is currently within a tenth of a point of last week's preliminary fast-affiliate rating (3.7). Note that last week's fast-affil rating grew by 0.2 in official nationals to a 3.9. From its first half-hour to its fourth, last night's " Voice" grew by 12 percent (to a 3.7 from a 3.3).

* From 10:01-11 p.m. ET, the Tuesday debut of "Grimm" (1.9/5 in 18-49, 6.0 million in total viewers) is #1 in 18-49 and all other key demographics among ABC, CBS and NBC in the time period. "Grimm" is currently retaining 100 percent of last week's Tuesday premiere in 18-49 rating and is up 4 percent in total viewers (6.009 million vs.5.773 million), pending updates.

* "Grimm's" 1.9 rating in 18-49 equals the show's top result since October 26, 2012 and the 6.0 million is "Grimm's" biggest overall audience since that same date. "Grimm" equaled NBC's top rating in the time period since the "Voice" finale on December 18, 2012 and delivered the network's biggest overall audience in the slot since that same date.

* Note that "Grimm" is one of the most time-shifted series on broadcast television, with the show's April 30 Tuesday debut growing by 49 percent when going from its "live plus same day" 18-49 rating (1.89) to its "live plus three day" result (2.81), which dramatically increased "Grimm's" margin of victory in the time period. ABC's second place Amanda Knox news special grew by 6 percent (to a 1.82 from a 1.71) and CBS's "Golden Boy" increased by 18 percent (to a 1.54 from a 1.30), meaning "Grimm's" margin over the #2 ABC special grew from 11 percent in L+SD (1.89 vs. 1.71) to 54 percent in L+3 (2.81 vs. 1.82).

* NBC is #1 or tied for #1 for the night among ABC, CBS, NBC and Fox in every key demographic - adults, men and women 18-34, 18-49 and 25-54.

In Late-Night Metered Markets Tuesday night:

* In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.4/6; CBS's "Late Show with David Letterman," 2.2/6; and ABC's "Jimmy Kimmel Live," 2.2/6.

* In the 25 markets with Local People Meters, adult 18-49 Wednesday results were: "The Tonight Show with Jay Leno," 0.8/4; "Late Show," 0.5/2; and "Jimmy Kimmel Live," 0.6/3.

* From 12:35-1:05 a.m. ET Wednesday night, ABC's "Nightline" averaged a 1.4/5 in metered-market households and a 0.4/2 in 18-49 in the Local People Meters.

* From 12:35-1:35 a.m. ET, "Late Night with Jimmy Fallon" (1.2/4 in metered-market households) tied CBS's "Late Late Show with Craig Ferguson" (1.2/4). In the 25 markets with Local People Meters, "Late Night" (0.5/3 in 18-49) topped "Late Late Show" (0.3/2).

* At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.8/3 in metered-market households and a 0.3/3 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.