With offerings including college football and the controversial return of Bravo’s ”Real Housewives of Beverly Hills” siphoning off viewers to cable, auds turned out in modest numbers for the Big Four broadcasters on Labor Day. Univision ended up winning the night with the conclusion of a reality contest.

According to preliminary national estimates from Nielsen, the three-hour grand finale of ”Pequenos Gigantes” (Little Giants) lifted Univision to the evening’s No. 1 ranking in both adults 18-49 (2.3/6) and total viewers (5.7 million). It was especially dominant in adults 18-34 (2.5/7), topping both ABC and Fox by 3 shares.

Elsewhere, Fox led among the Big Four in adults 18-49 with ”Hell’s Kitchen” (2.6/6 in 18-49, 5.8 million viewers overall), which was down about 10% week to week. The other recent solid reality performer on Monday, ABC’s ”Bachelor Pad,” was down by a similar amount (1.8/5 in 18-49, 5.9 million viewers overall) and figured to be most affected by the Bravo premiere.

CBS was solid as usual airing repeats of its comedies, with a second ”How I Met Your Mother” at 8:30 (1.4/4 in 18-49, 3.9 million viewers overall) followed by ”Two and a Half Men” (1.5/4 in 18-49, 5.0 million viewers overall) and ”Mike and Molly” (1.3/3 in 18-49, 5.1 million viewers overall). And things were pretty quiet at NBC, which aired a two-hour repeat of ”America’s Got Talent” (0.8/2 in 18-49, 3.8 million viewers overall) and the 10 p.m. news special ”Children of 9/11” (1.1/3 in 18-49, 3.5 million viewers overall).

Ratings for the season premiere of ”Real Housewives” were expected later today or tomorrow. It was the first episode since the August suicide of one of the show’s participants.

Preliminary 18-49 averages for the night: Univision, 2.3/6; Fox, 2.0/5; ABC, 1.5/4; CBS, 1.3/3; NBC, 0.9/2; CW, 0.2/1.

In total viewers: Univision, 5.7 million; ABC, 5.3 million; CBS and Fox, 4.5 million; NBC, 3.7 million; CW, 0.6 million.