NBC’s hot gameshow “Deal or No Deal” established more series highs Monday but CBS came away with a nightly victory in key demos thanks in part to a strong week-two showing for comedy “Old Christine.”

According to preliminary nationals from Nielsen, Julia Louis-Dreyfus laffer “The New Adventures of Old Christine” (5.2 rating/12 share in adults 18-49, 15.3 million viewers overall) rose about 8% from its premiere one week ago for the net’s best perf in the 9:30 timeslot this season; it held a hearty 95% of its demo lead-in from “Two and a Half Men” (5.5/13 in 18-49, 16.9 million viewers overall). The Eye also looked good at 10, winning with “CSI: Miami” (6.5/17 in 18-49, 19.5 million viewers overall), the night’s No. 1 program overall.

At NBC, “Deal or No Deal” racked up the net’s best series scores in Monday’s leadoff hour in 22 months (5.5/14 in 18-49, 16.6 million viewers overall), dominating its time period. That led into the highest-rated “The Apprentice 5” to date (4.2/10 in 18-49, 10.6 million viewers overall). A repeat “Medium” closed out the night in third for the net (2.6/7 in 18-49, 7.5 million viewers overall).

Fox was solid with the return of “Prison Break” (second-place 4.3/11 in 18-49, 10.3 million viewers overall) leading into “24” (5.5/13 in 18-49, 13.6 million viewers overall), which again won its hour in 18-49. Net was a close second to CBS for the night in 18-49.

ABC was on the high side at 9 with “Supernanny” (4.4/10 in 18-49, 10.9 million viewers overall) but fell off at 10 with the third episode of limited-run series “Miracle Workers” (2.8/7 in 18-49, 7.3 million viewers overall).

Preliminary 18-49 averages for the night: CBS, 5.1/12; Fox, 4.9/12; NBC, 4.1/10; ABC, 3.5/9; UPN, 1.2/3; WB, 1.1/3.

In total viewers: CBS, 15.3 million; Fox, 12 million; NBC, 11.6 million; ABC, 8.9 million; UPN, 3 million; WB, 2.4 million.