ABC’s “Shark Tank” and “20/20” joined CBS’ “Blue Bloods” as the standouts on a rather uneventful first Friday of the television season, which saw at least some repeat programming on three of the four major broadcast networks. The Alphabet prevailed in key demos while CBS led in total viewers.

According to preliminary national estimates from Nielsen, ABC led in adults 18-49 thanks in large part to “Shark Tank” (1.6 rating/6 share in adults 18-49, 6.0 million viewers overall), though the unscripted veteran was down 0.2 from its year-ago two-hour premiere. It was the night’s No. 1 show in 18-49 (1.6/6) as well as adults 25-54 (2.1/7) and persons 12-34 (1.0/5).

ABC kicked off the night with the season premiere of “Last Man Standing” (1.1/5 in 18-49, 6.3 million viewers overall), which won or shared the lead in its time period in all key categories but was down 0.2 from its season premiere of last year, and a special off-night repeat of new Tuesday series “The Muppets” (0.8/4 in 18-49, 3.8 million viewers overall). Closing the night, “20/20” (1.3/5 in 18-49, 5.4 million viewers overall) led its time period in 18-49 and 25-54 (1.8/6, tie).

At CBS, “The Amazing Race” (1.1/5 in 18-49, 5.8 million viewers overall) was on par with its year-ago premiere, which was up against tougher than usual competition from “Shark Tank.” It was followed by the season premieres of dramas “Hawaii Five-0” (1.0/4 in 18-49, 8.1 million viewers overall) and “Blue Bloods” (1.3/5 in 18-49, 9.9 million viewers overall), with the former down 0.2 and the latter up a tick vs. last year’s openers. “Blue Bloods” was easily the night’s most-watched program overall.

NBC, whose scripted Friday fare premieres next month, went with a repeat of “Best Time Ever With Neil Patrick Harris” (0.7/3 in 18-49, 3.1 million viewers overall) and a two-hour “Dateline” (1.0/4 in 18-49, 5.0 million viewers overall).

Fox got decent mileage out of a “Minority Report” repeat (0.7/3 in 18-49, 2.3 million viewers overall), which did nearly two-thirds of its premiere rating on Monday (1.1). A repeat of Wednesday newcomer “Rosewood” (0.5/2 in 18-49, 2.2 million viewers overall) capped the night for the network.

And CW aired and original “Masters of Illusion” (0.4/2 in 18-49, 1.4 million viewers overall), followed by repeats of “Whose Line Is It Anyway” (0.3/1 in 18-49, 1.2 million viewers overall).