Solid showings by “Big Brother”and repeat comedies “The Big Bang Theory”and “Two and a Half Men”lifted CBS to victory in key demos Thursday, a night that saw more local-market preemptions for preseason NFL games.

According to preliminary national estimates from Nielsen, “Big Brother”averaged a 2.2 rating/7 share in adults 18-49 and 6.4 million viewers overall in the 9 o’clock hour, standing as the night’s top show in 18-49 and up slightly week to week in total viewers. CBS got the night off to a winning start too with encores of “The Big Bang Theory”(2.1/7 in 18-49, 7.5 million viewers overall) and “Two and a Half Men”(1.7/6 in 18-49, 6.2 million viewers overall) and closed with a repeat “Person of Interest”(1.1/3 in 18-49, 5.4 million viewers overall); “Big Bang”was the night’s most-watched program overall as CBS won the night in total viewers.

ABC ran second on the night with original episodes of “Wipeout”at 8 (1.5/5 in 18-49, 5.4 million viewers overall) and 9 (1.7/5 in 18-49, 5.4 million viewers overall), followed by original drama “Rookie Blue”(1.2/4 in 18-49, 4.7 million viewers overall).

NBC’s reruns of “The Office”(1.0/3 in 18-49, 3.3 million viewers overall) and “Parks and Recreation”(0.9/3 in 18-49, 2.8 million viewers overall) were followed by original drama “Saving Hope”(0.8/2 in 18-49, 4.6 million viewers overall) and newsmag “Rock Center with Brian Williams”(1.2/3 in 18-49, 4.1 million viewers overall); at least in the preliminaries, “Rock Center”tied for the hour’s broadcast lead in adults 25-54 (1.6/4). NBC aired preseason Ravens football on the Baltimore station.

Fox aired encores of “Raising Hope”(0.8/3 in 18-49, 2.2 million viewers overall), “New Girl”(0.8/3 in 18-49, 2.0 million viewers overall) and “Glee”(0.7/2 in 18-49, 2.1 million viewers overall).

And at CW, “Oh Sit”(0.4/1 in 18-49, 0.9 million viewers overall) and “The Next”(0.3/1 in 18-49, 0.8 million viewers overall) were in line with their recent performances.

Preliminary 18-19 averages for the night: CBS, 1.8/5; ABC, 1.5/5; Univision, 1.3/4; NBC, 1.0/3; Fox, 0.7/2; CW, 0.3/1.

In total viewers: CBS, 6.2 million; ABC, 5.2 million; NBC, 4.1 million; Univision, 3.4 million; Fox, 2.1 million; CW, 0.9 million.