The combination of the Labor Day holiday and a big college football game on cable made for a quiet Monday at the broadcast nets, where encores of CBS comedies drew the night’s top ratings.

Early ratings weren’t available for ESPN’s coverage of the season-opening matchup of top-10 college teams Boise State and Virginia Tech, but it was expected to dominate in all key categories. On the broadcast side, meanwhile, ABC and CBS drew the most young adults while the Eye easily drew the most total viewers.

According to preliminary nationals from Nielsen, ABC led the 8-10 p.m. block among young adults with “Bachelor Pad” (2.0/5 in 18-49, 5.6 million viewers overall), which was on par with the previous week. It then fell off more than usual at 10 p.m. with “Dating in the Dark” (1.2/3 in 18-49, 3.1 million viewers overall), which may have hit a series low.

At CBS, a repeat of “How I Met Your Mother” (1.4/4 in 18-49, 4.5 million viewers overall) was followed by the special “CBS Fall Preview” (1.4/4 in 18-49, 5.0 million viewers overall). The net then picked up some steam at 9 with repeats of “Two and a Half Men” (2.1/5 in 18-49, 7.9 million viewers overall) and “The Big Bang Theory” (2.2/6 in 18-49, 7.6 million viewers overall) — the night’s top broadcast programs in both demos and total viewers — and stayed competitive at 10 p.m. with a repeat of “CSI: Miami” (1.5/4 in 18-49, 5.9 million viewers overall ).

NBC aired a two-hour repeat of “America’s Got Talent” (1.2/3 in 18-49, 4.8 million viewers overall) and an original edition of “Dateline” (1.5/4 in 18-49, 5.5 million viewers overall), with the latter delivering the timeslot’s best results in six weeks.

Fox struggled with repeats of “House” (1.0/3 in 18-49, 3.2 million viewers overall) and “Lie to Me” (1.0/2 in 18-49, 3.4 million viewers overall), and CW drew tiny numbers for repeats of last May’s season finales of “90210” (0.3/1 in 18-49, 0.8 million viewers overall) and “Gossip Girl” (0.3/1 in 18-49, 0.6 million viewers overall) in advance of their season premieres next week.

Preliminary 18-49 averages for the night: ABC and CBS, 1.7/5; Univision, 1.6/4; NBC, 1.3/3; Fox, 1.0/3; CW, 0.3/1.

In total viewers: CBS, 6.1 million; NBC, 5.0 million; ABC, 4.8 million; Univision, 3.9 million; Fox, 3.3 million; CW, 0.7 million.