Ariana Grande performs on Wednesday night's episode of NBC's "America's Got Talent."

Ariana Grande performs on Wednesday night's episode of NBC's "America's Got Talent." (Virginia Sherwood / NBC / August 27, 2014)

A round of eliminations and a performance by Ariana Grande helped "America's Got Talent" stay on top of the ratings on Wednesday.

The Nick Cannon-hosted show, which drew in 9.2 million viewers overall, earned a rating of 1.8 in the key 18-to-49-year-old demographic, according to Nielsen.

NBC, which also aired "Taxi Brooklyn," won the night in total viewership, averaging 6.4 million viewers. 

Meanwhile, with a rating of 1.5, CBS was the most-viewed network in the key demo. Roughly 6 million people tuned in to the network.

CBS' privacy-deprivation reality show "Big Brother" was the most-watched program among the key demo with a solid rating of 2.3. With about 6.7 million viewers, the show was the second-most-watched program of the night.

Also on the network, the Halle Berry sci-fi series "Extant" was up 10% from last week with a rating of 1.1 in the key demo. The show was the third-most-watched program of the night with roughly 5.7 million viewers. 

Two back-to-back reruns of ABC's "Modern Family" were the No. 3 and No. 4 most-watched shows in the key demo, earning ratings of 1.4 and 1.5.

The finale of ABC's "Motive" earned a 0.9 in the key demo, up 13% in from last season's finale. With roughly 3.7 million viewers, the show rounded out the top 10 most-viewed programs of the night.

Fox's "So You Think You Can Dance" was up 22% from last week among the key demo with a rating of 1.1. The show averaged 3.6 million viewers.

With a rating of 1.1., ABC and Fox tied for third-most-watched network in the key demo.

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