America's Got Talent's third-season premiere last night on NBC ranked as the No. 1 summer debut to date in average total viewers.

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America's Got Talent's two-hour third-season premiere at 9PM ET/PT averaged 12.8 million total viewers and a 3.6/10 rating/share in the Adults 18-49 demographic, according to Nielsen Media Research's Fast Affiliate Live Plus Same Day ratings.

In addition to ranking as the No. 1 summer debut to date among average total viewers, America's Got Talent's debut broadcast also ranked as the No. 2 primetime entertainment telecast of the summer to date on any network -- behind only Grey's Anatomy's May 22 season finale.

America's Got Talent's third-season premiere also tied Fox's May 28 broadcast of So You Think You Can Dance as the No. 1 summer debut to date among Adults 18-49.

America's Got Talent's third-season debut grew from its first half-hour to its fourth by 29% among Adults 18-49 (3.1/9 to 4.0/11) and by 18% -- or 2.1 million -- average total viewers (11.5 million to 13.6 million).

Despite airing against ABC's coverage of the NBA Finals, America's Got Talent's third-season premiere was the reality competition series' third-strongest telecast ever in total viewers behind the second-season's finale and debut.