Friday, July 17, 2015 ratings — New episodes: Dateline NBC, The Messengers, Masters of Illusion, Primetme: What Would You Do? and 20/20. Reruns: America’s Got Talent, Whose Line Is It Anyway?, Shark Tank, Elementary, Hawaii Five-0, Blue Bloods, MasterChef and Gotham.

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These are the fast affiliate ratings. The percentages represent the change since the previous original episode. (Percentages aren’t given for reruns or specials.) To see past ratings for a particular show, click the show’s link. The show pages are updated with the daily final ratings when they become available. Those pages include season averages to date.

What were you watching last night? Original network programming, reruns, cable, or something else?