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“The Tonight Show Starrring Jimmy Fallon” continues to generate strong year-over-year ratings gains for NBC, teaming with “Late Night with Seth Meyers” as the net dominated latenight in the third quarter.

Meanwhile, ABC’s “Jimmy Kimmel Live” and “Nightline” were both on the rise, but young-adult auds turned away from CBS’ lame-duck latenight duo of “Late Show With David Letterman” and “Late, Late Show With Craig Ferguson.”

According to Nielsen estimates for the period of June 30-Sept. 21, NBC’s “Tonight Show” ruled the 11:35 p.m. hour with an average nightly audience of 3.93 million viewers, including 1.49 million adults 18-49. It was up vs. the Jay Leno-hosted “Tonight” of a year ago by 41% in the demo and 13% in overall audience.

ABC’s “Jimmy Kimmel Live” ran second in both categories, rising 2% in adults 18-49 (to 727,000) and 11% in total viewers (to 2.34 million). This is the most-watched Q3 ever for Kimmel, whose show moved up to 11:35 p.m. in early 2013.

CBS’ “Late Show with David Letterman” finished down 20% vs. the third quarter of last year in adults 18-49 (to 553,000) and was off 9% in total viewers (to 2.33 million, a hair behind Kimmel).

At 12:35 a.m., “Late Night with Seth Meyers” led with 1.51 million viewers (down 11% from last year when the show was hosted by Fallon), including 629,000 adults 18-49 (down 5%). CBS’ “Late, Late Show with Craig Ferguson” was down 17% in the demo (to 361,000) and 4% in total viewers (1.22 million).

ABC’s half-hour “Nightline” was up vs. last year in both adults 25-54 (+9% to 622,000) and total viewers (+5% to 1.50 million).

At TBS, “Conan” was down 9% vs. last year in adults 18-49 viewers (513,000 vs. 563,000) and 4% in total viewers (862,000 vs. 896,000).

Comedy Central’s “Daily Show with Jon Stewart” (874,000 adults 18-49, 1.659 million viewers overall) was down in the single-digits from last year, while “Colbert Report” (697,000 adults 18-49, 1.298 million total viewers) was off by about 10%.