There wasn’t a whole lot happening on the broadcast ratings front Sunday, with CBS’ “Big Brother” once again the night’s standout in key demos and ABC’s unscripted combo of “Wipeout” and “Rising Star” edging downward to series lows.

According to preliminary “live plus same-day” Nielsen estimates, “60 Minutes” (0.9 rating/4 share in 18-49, 7.7 million viewers overall) opened the night for CBS by winning its timeslot in key demos while also ruling as the night’s most-watched program overall. It was followed by “Big Brother” (2.1/7 in 18-49, 6.5 million viewers overall), which again more than doubled its young-adult lead-in even while losing total viewers from the newsmag; it was in line with last week’s demo rating while up a bit in total viewers.

From 9 to 11 p.m., firstrun dramas “Unforgettable” (1.0/3 in 18-49, 6.4 million viewers overall) and “Reckless” (0.6/2 in 18-49, 4.2 million viewers overall) were steady in the demo week to week, though the latter drew its largest overall audience in its five airings to date. “Reckless” finished behind repeat dramas on ABC and NBC in 18-49.

At ABC, a two-hour “Wipeout” (0.8/3 in 18-49, 3.2 million viewers overall) was down three tenths from its hourlong average of last week, and “Rising Star” (0.9/3 in 18-49, 3.5 million viewers overall) was down a bit from last week for its lowest scores in its six weeks on the air. A repeat “Castle” closed things out (0.6/2 in 18-49, 3.4 million viewers overall).

Fox went with repeats of animated laffers “American Dad” (0.6/2 in 18-49, 1.4 million viewers overall), “Bob’s Burgers” (0.8/3 in 18-49, 1.7 million viewers overall), “The Simpsons” at both 8 (1.1/4 in 18-49, 2.2 million viewers overall), “Family Guy” (1.4/5 in 18-49, 3.0 million viewers overall) and a second “American Dad” at 9:30 (1.3/4 in 18-49, 2.6 million viewers overall). From 9 to 10 p.m., “Family Guy” and “American Dad” stood as the timeslot’s top broadcasts in 18-49.

NBC aired encores of “American Ninja Warrior” (0.7/3 in 18-49, 3.0 million viewers overall) and dramas “Chicago Fire” (0.6/2 in 18-49, 2.6 million viewers overall) and “Chicago PD” (0.7/2 in 18-49, 3.3 million viewers overall), the latter of which drew more young adults than CBS’ original “Reckless.”

Preliminary 18-49 averages for the night: CBS, 1.2/4; Fox, 1.0/4; Univision, 0.8/3; ABC and NBC, 0.7/2; Telemundo, 0.4/1.

In total viewers: CBS, 6.2 million; ABC, 3.3 million; NBC, 3.0 million; Fox, 2.2 million; Univision, 2.1 million; Telemundo, 1.0 million.