It's the first time the programs will face off directly since last summer, when "Dateline" attracted an average audience of 6.2 million viewers, 28% more than "20/20's" 4.8 million, according to Nielsen. So far this season, the two shows have been more closely matched, with "Dateline" drawing 7.7 million viewers Fridays at 9 p.m., while "20/20" has pulled in 7 million viewers Fridays at 10 p.m.
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