Fox won Monday’s ratings race in key demos as ”Hell’s Kitchen” and ”MasterChef” showed gains opposite ABC’s sluggish premiere of ”Bachelor Pad.” At NBC, ”American Ninja Warrior” ended its season on a nice note.

According to preliminary national estimates, ”Hell’s Kitchen” dominated Monday’s opening hour in most key categories (2.6/8 in 18-49, 6.3 million viewers overall), holding steady week to week. And at 9, ”MasterChef” (2.7/7 in 18-49, 6.4 million viewers overall) edged up for a fourth straight week and also easily led its hour. The Fox shows stood as the night’s top two telecasts in both 18-49 and total viewers.

NBC followed a repeat of ”Fear Factor” (1.3/4 in 18-49, 4.1 million viewers overall) with the two-hour finale of ”American Ninja Warrior” (2.0/5 in 18-49, 4.9 million viewers overall), which grew 11% week to week and comfortably led the 10 o’clock hour.

At ABC, the third-season premiere of ”Bachelor Pad” settled for a 1.4/4 in 18-49 and 4.7 million viewers overall from 8 to 10 p.m., down more than 30% from last year’s opener. And the net continues to see weak scores at 10 p.m. for ”The Glass House” (0.8/2 in 18-49, 2.3 million viewers overall), which tied Telemundo for fourth-place among the broadcasters in the 18-49 demo.

CBS aired repeats of its in-season Monday lineup: ”How I Met Your Mother” (1.1/3 in 18-49, 4.1 million viewers overall), ”2 Broke Girls” (1.3/4 in 18-49, 4.6 million viewers overall), ”Two and a Half Men” (1.6/4 in 18-49, 5.8 million viewers overall), ”Mike and Molly” (1.4/4 in 18-49, 5.2 million viewers overall) and ”Hawaii Five-0” (1.1/3 in 18-49, 5.6 million viewers overall).

Preliminary 18-49 averages for the night: Fox, 2.6/8; NBC, 1.7/5; CBS and Univision, 1.3/4; ABC, 1.2/4; CW, 0.3/1.

In total viewers: Fox, 6.4 million; CBS, 5.1 million; NBC, 4.6 million; ABC, 3.9 million; Univision, 3.6 million; CW, 0.6 million.