“American Idol” is sprinting to the starting gate, dominating Wednesday with its results-show edition and leading Fox to a comfortable primetime ratings victory, according to preliminary nationals from Nielsen. ABC’s “Lost” impressed in the evening’s opening hour.

At Fox, “Idol” (roughly 11.5 rating/29 share in adults 18-49, 27.2 million viewers overall) towered over the competish and was up impressively over the same night a year ago. Also for the net, “Stacked” led at 9:30 (roughly 5.6/14 in 18-49, 12.3 million viewers overall) and the hourlong season finale of “That ’70s Show” placed second at 8 (4.2/12 in 18-49, 8.6 million viewers overall).

ABC ran second on the night, leading easily at 8 with “Lost” (6.4/19 in 18-49, 18.0 million viewers overall) and then doing OK from 9 to 11 with a two-hour “Alias” (3.6/9 in 18-49, 9.2 million viewers overall).

CBS was paced by a slot-leading victory at 10 for “CSI: NY” (4.5/12 in 18-49, 12.0 million viewers overall) over NBC’s “Law & Order” (3.9/10 in 18-49, 12.1 million viewers overall). Also for the Peacock, there was no pop for the finale of six-week drama “Revelations” (3.0/8 in 18-49, 8.1 million viewers overall).

UPN’s “America’s Next Top Model 4” did well at 8 with its finale (2.8/8 in 18-49, 5.7 million viewers overall) as did the WB’s “Smallville” with its 90-minute season finale (2.4/7 in 18-49, 5.3 million viewers overall).

Preliminary 18-49 averages for the night: Fox, 6.4/17; ABC, 4.6/12; CBS, 3.0/8; NBC, 2.9/8; UPN, 2.2/6; WB, 2.1/6.

In total viewers: Fox, 14.3 million; ABC, 12.1 million; CBS, 9.2 million; NBC, 8.8 million; WB, 4.7 million; UPN, 4.4 million.