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With “American Idol” doing its thing on three nights, Fox’s competish had no chance in last week’s ratings race — even ABC, which had a huge Sunday with the Oscars.

Fox easily led in all key demos as well as total viewers as it continues its second-half surge. Last week, three segs of “American Idol” comprised 27% of the net’s sked, ranking second, third and fourth among all primetime shows in 18-49 — behind only the Academy Awards.

According to in-home viewing estimates provided by Nielsen, Fox’s 5.5 rating/14 share towered over ABC’s 4.6/12 and was miles ahead of CBS (3.8/10) and NBC (3.3/8). After three good weeks with the Olympics, the Peacock was back in its customary fourth-place position.

“Idol” is outperforming its averages from a year ago at this point by 11% in adults 18-49 and by 12% in total viewers.

Show garnered similarly gaudy numbers on Tuesday (12.4/31 in 18-49, 30.09 million viewers overall) and Wednesday (12.2/31, 29.64m) and easily led its special Thursday slot (10.9/27, 26.32m) — the net’s best showing at 8 on the night in at least 15 years.

Contributing to Fox was Monday’s “24” (5.6/13, 17.04m) and Thursday’s finale of “Skating With Celebrities” (5.1/12, 14.12m). New laffer “Free Ride,” headed to its regular Sunday slot this week, also had a healthy showing Wednesday with its special post-“Idol” preview (6.1/15, 13.57m).

At ABC, “The 78th Annual Academy Awards” (13.9/33 in 18-49, 38.94m) dominated Sunday (Daily Variety, March 6), though it was down 8% vs. last year, and became the season’s most-watched entertainment program.

Also for the Alphabet, “Lost” was again Wednesday’s No. 1 scripted show (6.9/16, 16.43m) and Monday’s “The Bachelor: Paris” hit highs with its two-hour finale (5.1/12, 11.53m).

CBS, back in business after loading up on repeats opposite the Olympics, ran third in both 18-49 and 25-54. Standouts included Monday’s “Two and a Half Men” (5.6/13, 17.04m) and Thursday’s “CSI” (9.0/21, 27.81m).

Two-hour season preem of “The Amazing Race 9” was a little soft (4.1/10 in 18-49, 10.40m) as the franchise looks to bounce back from last fall’s ill-received family edition.

NBC’s highlight was the special five-night return of gamer “Deal or No Deal,” which won its hours on Monday (4.5/12 in 18-49, 13.44m) and Friday (4.0/12, 12.04m). Over the course of the week, “Deal” upgraded the opening hour for NBC by 38% in 18-49 (3.6 vs. 2.6) over its first-quarter, non-Olympic averages.

Also, “Las Vegas” looked good in its Friday bow (3.7/11, 11.03m), and “Conviction” did OK at 10 in its series preem (3.4/10, 10.31m).

The WB topped UPN in adults 18-34 (1.5/4 to 1.3/4), with the latter to get a big lift this week from the return of “America’s Next Top Model.” Spanish-language broadcaster Univision topped them both (1.8/5) andranked fifth in 18-49 (1.6/4).

It was a fairly quiet week in cable, with USA and TBS in a tie for the primetime 18-49 crown (0.8 rating) and TNT (0.7) close behind. Week’s top scripted skein in key demos was Friday’s “Monk” on USA (1.4/4, 4.89m).

ESPN scored Saturday with Duke-North Carolina college basketball (1.6/5 in 18-49, 4.70m) — the most-watched college hoops game on the cabler in more than four years. And if you add in the aud for ESPN2 (which also aired the game), it’s the highest-rated game in net history.

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On Monday of the current week, back-to-back original episodes of “24” carried Fox to victory in 18-49, while ABC’s unscripted skein “Miracle Workers” had a modest bow.

At 8 p.m., “24” was a close second (4.8/12 in 18-49, 11.89m), but the second hour notched the best regular-slot score since skein’s Jan. 16 premiere (5.8/13 in 18-49, 13.98m), winning in 18-49, 25-54 and all key male demos.

CBS, which took the night in adults 25-54, was paced as usual by “CSI: Miami” (6.1/15 in 18-49, 18.61m) and “Two and a Half Men” (5.7/13, 17.06m), with “Courting Alex” placing second in between them at 9:30 (4.5/10, 13.77m).

ABC had similar so-so numbers from start to finish with “Wife Swap” (3.5/9, 8.60m), the return of “Supernanny” at 9 (3.8/9, 9.70m) and the preem of tearjerker reality series “Miracle Workers” (third-place 3.4/9 in 18-49, 8.56m).

All three NBC shows were up a bit week-to-week, with “Deal or No Deal” winning at 8 (best-yet 4.9/12 in 18-49, 14.66m) and “The Apprentice 5” (4.0/9, 9.78m) running third. “Medium” (4.1/11 in 18-49, 10.67m) closed out the night in second.