The USC Trojans’ convincing victory over the Oklahoma Sooners in the Orange Bowl made ABC an easy winner on the first Tuesday of the new year, according to preliminary nationals from Nielsen. NBC also had a good night with reality skein “The Biggest Loser,” new comedy “Committed” and a special “Dateline.”

Reliable affiliate-based prelims weren’t available for the live football game, but ABC figures to come in with its highest-rated night of the season. In Nielsen’s metered-market overnights, college football’s championship matchup averaged a 14.2 household rating/22 share, on par with last year’s LSU-Oklahoma tilt.

At NBC, the penultimate episode of “The Biggest Loser” set series highs (4.8/12 in adults 18-49, 11.4 million viewers overall), delivering the net’s best demos with series programming in the 8-9:30 time period in nearly two years. That helped new romantic comedy “Committed” get good sampling at 9:30 (4.5/10 in adults 18-49, 10.2 million viewers overall), and at 10, Matt Lauer’s interview of former Scott Peterson girlfriend Amber Frey scored big on a special “Dateline” (6.0/15 in adults 18-49, 15.9 million viewers overall).

CBS was paced by “The Amazing Race” (4.4/10 in adults 18-49, 10.7 million viewers overall), Fox by a repeat of “House” (2.0/5 in adults 18-49, 5.5 million viewers overall).

Preliminary 18-49 averages for the night: ABC, 7.7/19; NBC, 5.1/13; CBS, 3.3/8; Fox, 1.9/5; WB, 1.3/3; UPN, 1.2/3.

In total viewers: ABC, 22.1 million; NBC, 12.7 million; CBS, 9.3 million; Fox, 4.9 million; UPN, 3 million; WB, 3 million.