ABC’s hot rookie “Quantico” saw its first week-to-week decline on Sunday behind a fading “Blood & Oil,” with both shows likely impacted by the return of AMC megahit “The Walking Dead.” NBC won the night with “Sunday Night Football,” though it’s likely that the zombie drama will beat it in young adults.

According to preliminary national estimates from Nielsen, “Quantico” averaged a 1.6 rating/5 share in adults 18-49 and 5.7 million viewers overall, down from 1.9 in the demo it had done with its first two episodes. While it has clearly been bringing its own audience to ABC on the night, “Quantico” had to be impacted by its significantly lower lead-in this time around from “Blood & Oil” (0.8/2 in 18-49, 3.6 million viewers overall), as the Don Johnson-Chace Crawford soap dropped 38% (0.5) from its week two score of last week.

“Quantico” became the first new scripted series this fall to grow in 18-49 rating during its second week, as last Sunday’s episode did a 3.3 in L+3, up from a 3.1 for its premiere. It figures to see substantial time-shifted gains once again, especially since the expanded premiere of “The Walking Dead” ran until about 10:30.

ABC opened its night with the season premiere of “America’s Funniest Home Videos” (1.1/4 in 18-49, 5.4 million viewers overall), which was down a tick from its year-ago opener as it introduced new host Alfonso Ribiero. And “Once Upon a Time” (1.6/5 in 18-49, 5.2 million viewers overall) was down 0.2 week to week, tying with “Quantico” as the night’s top broadcast entertainment series in the demo.

NBC’s “Sunday Night Football” hit a season low in the overnights with its San Francisco 49ers-New York Giants matchup (13.1 household rating/22 share), but the franchise continues to track ahead of last season; a year ago, the Cincinnati-New England matchup in Week 5 of the season did a 12.8/20. And this was the highest metered-market household rating for an NFL primetime game vs. a Major League Baseball Division Series game since 1997.

The top local ratings for the 49ers-Giants game on NBC were Sacramento (24.2/41), San Francisco-Oakland (22.6/41), Las Vegas (20.7/34), West Palm Beach (16.9/27) and New York (16.8/27).

In the preliminary national estimates from Nielsen, the Giants’ 30-27 victory over the 49ers averaged a 5.8 rating/16 share in adults 18-49 and 16.1 million viewers overall from 8:30 to 11 p.m., with these averages expected to rise in the nationals by upward of 15%. Ratings for “The Walking Dead” are expected to be released later today.

Elsewhere on the broadcast front Sunday, CBS followed NFL doubleheader action with “60 Minutes” (3.0/9 in 18-49, 15.2 million viewers overall), featuring an interview with President Obama, “Madam Secretary” (1.5/4 in 18-49, 10.9 million viewers overall), “The Good Wife” (1.2/3 in 18-49, 8.5 million viewers overall) and “CSI: Cyber” (0.9/3 in 18-49, 6.2 million viewers overall). All three dramas were on par with their week-earlier season premieres on a night when the network didn’t have a national football audience leading into primetime.

Fox kicked off its night with a repeat of “The Grinder” (0.9/3 in 18-49, 2.6 million viewers overall), whose averages include football in some markets. It was followed by originals of “Bob’s Burgers” (1.0/3 in 18-49, 2.4 million viewers overall), “The Simpsons” (1.5/5 in 18-49, 3.3 million viewers overall), “Brooklyn Nine-Nine” (1.3/4 in 18-49, 2.7 million viewers overall), “Family Guy” (1.4/4 in 18-49, 2.8 million viewers overall) and “The Last Man on Earth” (1.1/3 in 18-49, 2.7 million viewers overall). Compared with two weeks ago, when Fox didn’t benefit from a national NFL overrun, “The Simpsons” was even but the other shows all posted declines.