Fox rolled again on the final Tuesday of the season, with dominant perfs by “American Idol” and “House” virtually clinching the net’s May sweep victory among young adults.

Season’s final Tuesday also saw ABC bomb with its Donald Trump biopic, NBC get in a few good punches with its “Contender” finale and CBS drama “NCIS” show big year-to-year gains with its finale.

Heading into Wednesday, the final night of the sweep and the season, Fox had pulled into a tie with CBS for the month’s 18-49 lead (4.2 rating/12 share), according to Nielsen. The two-hour “American Idol” finale was expected to give the net a roughly two-tenths advantage when final numbers are tallied.

CBS will win the month in adults 25-54 and total viewers, as projected.

On Tuesday, “American Idol” (11.6 rating/30 share in adults 18-49, 28.05 million viewers overall) delivered its best Tuesday finale numbers for any of its four editions, topping the other five broadcast nets combined in 18-49. Heading into Wednesday’s finale, this has been the highest-rated “Idol” season to date, up about 5% year-to-year.

“House” then cleaned up at 9 with series-highs for its first-season finale (7.7/18 in 18-49, 19.52m).

NBC placed second on the night, with “Law & Order: SVU” winning easily at 10 (6.0/15 in 18-49, 16.38m) and the finale of boxing skein “The Contender” doing solid numbers from 8 to 10 (3.8/9 in 18-49, 7.98m), running second to Fox in adults 18-34 (4.3/11).

At CBS, “NCIS” ran second at 8 (3.5/9 in 18-49, 14.3 million viewers overall) with its best scores since Jan. 10 (pre-“Idol”). Military crime drama was up 46% from its year-ago finale.

And two-hour special “Rob & Amber Get Married,” featuring the lovebirds from CBS reality series “Survivor” and later “The Amazing Race 7,” did credible numbers from 9 to 11 (3.6/9 in 18-49, 9.66m).

Elsewhere, ABC did its weakest Tuesday numbers of the season with “Trump: Unauthorized” (2.1/5 in 18-49, 5.55m), while UPN’s Jenny McCarthy laffer “Bad Girl’s Guide” opened meekly at 9:30 (0.8/2 in 18-49, 1.83m). Leading into “Bad Girls” was week two of unscripted series “Britney & Kevin: Chaotic” (1.5/4 in 18-49, 3.05m), which dropped from its preem.

And at the WB, the two-hour season finale of “One Tree Hill” (1.6/4 in 18-49, 3.61m) placed second to Fox in femmes 12-34 (3.8/10).