CBS edged out ABC for demo supremacy on the second Thursday of the season, a night that saw all of the top shows decline.

According to preliminary “live plus same-day” DVR estimates from Nielsen, ABC’s “Grey’s Anatomy” (7.4/18 in 18-49, 18.1 million viewers overall) once again stood as the night’s top program among adults 18-49, opening up a bit more of a cushion over CBS’ “CSI” (6.3/16 in 18-49). In a reversal of last week, “Grey’s” moved ahead of its drama rival in adults 25-54 (8.1/18 to 7.8/18) while “CSI” was the night’s most-watched program overall for a second straight week. NBC’s “The Office” held tough with another hourlong episode (4.5/11 in 18-49, 8.5 million viewers overall).

In the opening hour, CBS’ “Survivor: China” (4.4/13 in 18-49, 14.1 million viewers overall) was an easy winner, with ABC’s “Ugly Betty” (3.4/10 in 18-49, 9.8 million viewers overall) and NBC’s combo of “My Name Is Earl” (3.4/10 in 18-49, 8.0 million viewers overall) and “30 Rock” (3.4/9 in 18-49, 7.4 million viewers overall). “30 Rock,” in its season premiere and featuring guest star Jerry Seinfeld, achieved a series high in 18-49.

Closing out the night, it was a tight three-way demo battle between CBS’ “Without a Trace” (3.8/11 in 18-49, 14.5 million viewers overall), NBC’s “ER” (3.7/10 in 18-49, 9.0 million viewers overall) and ABC’s “Big Shots” (3.7/10 in 18-49, 8.7 million viewers overall), with “Trace” the easy leader among total viewers. “Big Shots” figures to drop a tick or two in the nationals (due to “Grey’s Anatomy” spilling over into its first half-hour by two minutes).

Fox remained a distant fourth on the night, but was the only net not to decline from the previous week. “Are You Smarter Than a 5th Grader” (2.3/7 in 18-49, 8.5 million viewers overall) was up a bit, while “Don’t Forget the Lyrics” (1.8/4 in 18-49, 5.8 million viewers overall) was flat.

And CW’s “Smallville” (1.8/6 in 18-49, 4.6 million viewers overall) was off slightly from the previous week’s season opener, while “Supernatural” (1.2/3 in 18-49, 3.0 million viewers overall) was overwhelmed at 9, coming in well below last season’s premiere.

Preliminary 18-49 averages for the night: CBS, 4.9/13; ABC, 4.8/13; NBC, 3.8/10; Fox, 2.1/5; Univision, 1.6/4; CW, 1.5/4.

In total viewers: CBS, 16.5 million; ABC, 12.2 million; NBC, 8.4 million; Fox 7.1 million; CW, 3.8 million; Univision, 3.7 million.