The combo of “Lost” and “Alias” proved too tough for the competish Wednesday, as ABC rolled to ratings victories in all key categories, according to preliminary nationals from Nielsen.

From 8 to 9:03, “Lost” (projected 8 rating/21 share in adults 18-49, 20.9 million viewers overall) dominated with its second best scores to date – behind only last week. “Alias” (9:03-10:02) followed with strong week-two results (projected 5.9 rating/15 share in adults 18-49, 14.1 million viewers overall), easily leading its time period as well. “Wife Swap” closed things out for ABC with solid, but third-place scores (projected 4.1/11 in adults 18-49, 9.6 million viewers overall).

In the 10 o’clock hour, NBC’s “Law & Order” (4.7/12 in adults 18-49, 14.7 million viewers overall) again held up well opposite CBS’ “CSI: NY” (4.7/12 in adults 18-49, 13.7 million viewers overall), with the NBC vet tying in 18-49 and leading its crime rival in other demos as well as total viewers.

Also on the night, NBC didn’t do much with week two of “Sports Illustrated Swimsuit Model Search” at 8 (2.4/6 in adults 18-49, 6.1 million viewers overall), and CBS comedy “Center of the Universe” drooped at 9:30 (3.3/8 in adults 18-49, 9.7 million viewers overall), retaining 80% of its lead-in from “King of Queens” (4.1/10 in adults 18-49, 11.6 million viewers overall).

Fox’s “Nanny 911” continues to perform well at 9 (4/10 in adults 18-49, 9.7 million viewers overall), drawing its largest overall aud to date.

Preliminary 18-49 averages for the night: ABC, 6.1/15; CBS, 3.5/9; NBC, 3.5/9; Fox, 3.4/8; UPN, 1.1/3; WB, 0.9/3.

In total viewers: ABC, 15 million; CBS, 11.6 million; NBC, 10.9 million; Fox, 7.7 million; UPN, 2.9 million; WB, 2.3 million.