(Reuters) - Yahoo Inc said its free streaming of the National Football League game between the Buffalo Bills and Jacksonville Jaguars at Wembley Stadium in London on Sunday got 33.6 million views across all of its platforms.
More than 15.2 million unique viewers tuned in for the webcast, Adam Cahan, Yahoo's senior vice president for product and engineering, said on a blog post.
Yahoo had guaranteed advertisers 3.5 million viewers in the United States, two media buyers familiar with the situation had told Reuters last week.
Yahoo's viewer numbers might have been given a boost because it streamed the game to everyone who visited Yahoo's home page, whether they wanted to see the game or not, Re/code reported.
Yahoo's streaming of the game was the first time viewers around the world could watch an NFL game online for free.
Viewers watched more than 460 million minutes of the game, and about a third of the viewers were outside the United States, spread across 185 countries, Yahoo said.
Yahoo said the streaming reached high-definition levels with a top speed of over 7.64 megabits per second.
"Not much of a sports fan, but this @Yahoo stream of the #NFL game is beautiful on mobile. Just the way live events should be," viewer Parker Sewell tweeted on Sunday.
But while many users took to Twitter to praise the quality of the webcast, some complained about freezing screens and a blurry picture.
"Seconds after every big play, my screen freezes. NFL on Yahoo!!!!," viewer Michael Mendelson tweeted. (http://bit.ly/1LwWlBh)
Yahoo's Cahan said more than 30 top brands advertised during the webcast, "making this a sold-out event."
The Jaguars beat the Bills 34-31 in the game, which lasted for 3 hours and 15 minutes.
Yahoo shares were flat in morning trading.
(Reporting by Supantha Mukherjee in Bengaluru; Editing by Ted Kerr and Maju Samuel)