UPDATED: With the Bruce Jenner interview, "20/20" scored its biggest ratings in 15 years, ABC said.
The two-hour interview averaged 17.1 million viewers Friday, the second night of the May ratings period. In the chat with Diane Sawyer, Jenner announced that he had wrestled with gender identity for decades and considered himself a woman.
The talk had been conducted in February but held till the ratings period, a strategy that paid off handsomely for the Disney-owned network.
ABC easily won the night in total viewers and was the victor in the 18-to-49 age group by a wide margin. ABC had its most-watched Friday since January 2003.
ABC started the night with "Shark Tank," which drew 7.9 million viewers, according to ratings released Monday.
The prime-time averages in total viewers: ABC with 14.1 million, CBS with 8 million, NBC with 4.5 million, Fox with 3 million for "Night at the Museum 2" and The CW with 790,000.
With the 18-to-49 age group, ABC scored a 4.1 rating. Second-place CBS put up a 1.1 rating. The Jenner interview posted a 5.2 rating with the 18-to-49 age group; it scored an impressive 6.5 rating with the 25-to-54 age group.
The CBS lineup, in total viewers: "The Amazing Race" with 5.8 million viewers, "Hawaii Five-0" with 8.4 million and "Blue Bloods" with 10 million.