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Shows like Fox’s “MasterChef” and CBS’ “Under the Dome” may have gotten higher ratings, but the standouts on Monday night were opening-hour alternative series “Running Wild with Bear Grylls” on NBC and “Whose Line Is It Anyway” on CW — both of which hit highs. “Whose Line,” in fact, surged to multiple-year timeslot highs for the net.

According to preliminary “live plus same-day” national estimates from Nielsen, “Running Wild with Bear Grylls” averaged a 1.5 rating/5 share in adults 18-49 and 4.6 million viewers overall in the 8 o’clock hour, up 15% (0.2) week to week. “Running Wild,” whose Monday installment featured Channing Tatum, closed the 18-49 gap with timeslot leader “MasterChef” (1.8) while pulling ahead of ABC’s “Bachelor in Paradise” (1.4). Through three weeks, “Running Wild with Bear Grylls” is the summer’s top-rated new unscripted series.

From 9 to 11 p.m., an “American Ninja Warrior” recap special did pretty well (1.4/4 in 18-49, 4.3 million viewers overall), down 30% from last week’s firstrun episode but enough to win the time period among the major networks in 18-49.

Over at CW, “Whose Line Is It Anyway” (0.7/2 in 18-49, 1.9 million viewers overall) was up a tenth from last week to hit summer highs in the demo as well as total viewers, and a repeat followed at 8:30 with identical scores. The network has struggled in the Monday-at-8 hour in recent years, with “Whose Line” logging the timeslot’s best demo result since January 2012 and its largest overall audience there since December 2010.

The biggest week to week surge for “Whose Line,” whose episode last night featured guest star Padma Lakshmi, was in women 18-34 (up 75%, 0.4 to 0.7).

Fox, which edged out NBC for the night’s 18-49 lead, opened with “MasterChef” (1.8/6 in 18-49, 5.2 million viewers overall), which was down 10% (0.2) from last week and may have lost some audience to the rising reality shows in its timeslot; despite the declines, the Gordon Ramsay cooking contest was Monday’s No. 1 program in 18-49. It was followed by “Hotel Hell” (1.3/4 in 18-49, 3.8 million viewers overall), which was down a tenth from last week for its lowest score in four airings to date.

CBS aired repeats of comedies “2 Broke Girls” (1.1/4 in 18-49, 4.7 million viewers overall), “Mom” (1.0/3 in 18-49, 4.5 million viewers overall), “Mike & Molly” (1.0/3 in 18-49, 5.1 million viewers overall) and “Two and a Half Men” (1.0/3 in 18-49, 5.0 million viewers overall), followed by “Under the Dome” (1.5/5 in 18-49, 6.9 million viewers overall), which was down a smidge in the demo and up in total viewers from last week, remaining the night’s top show in the latter.

At ABC, “Bachelor in Paradise” (1.4/5 in 18-49, 5.1 million viewers overall) was steady in its second week, drawing the same 5 share in 18-49 as NBC and Fox from 8 to 10 p.m. and winning the block in total viewers. And “Mistresses” (1.0/3 in 18-49, 3.5 million viewers overall) was up a tenth to match a five-week high in 18-49.

Preliminary 18-49 averages for the night: Fox, 1.6/5; NBC, 1.5/5; ABC and Univision, 1.3/4; CBS, 1.2/4; Telemundo, 0.5/2; CW, 0.5/1.

In total viewers: CBS, 5.5 million; ABC, 4.6 million; Fox, 4.5 million; NBC, 4.4 million; Univision, 3.5 million; CW and Telemundo, 1.3 million.