While the open beta ran for just under a week, it served up the 21 heroes from the full game, with several stages to experience ahead of the May 24th launch. In contrast, developer 2K's similar Battleborn attracted just over 2 million players during its own beta at the beginning of April.
With Overwatch's official debut around the corner, it'll be intriguing to see what the numbers top out at for launch, especially with competition out there in the form of Battleborn and other recent gaming releases.
Cheers to the incredible 9.7 MILLION of you who joined us in the @PlayOverwatch Open Beta! Thank you, heroes💙 pic.twitter.com/RVug4KsFE4
— Blizzard Ent (@Blizzard_Ent) May 12, 2016