The draft was considered weak and the first two picks, Ben Simmons to the Philadelphia 76ers and Brandon Ingram to the Los Angeles Lakers, were known in advance.
It was the lowest rated draft since 2012.
Adrian Wojnarowski's The Vertical ran a competing simulcast with analysis, news and the announcement of picks before ESPN on an online stream that received positive reviews.
A Yahoo spokesperson told Awful Announcing Friday the almost-four-hour stream drew 3.7 million total video views, reached more than 2.8 million unique viewers across all devices, and averaged 34 minutes of watch time per user.
ESPN's coverage averaged 2.994 million viewers compared to Yahoo's total number of viewers.