The Overwatch community also will have new ways to join in the fun around the league.
Overwatch is hugely popular, with 35 million players worldwide.
Earning 9/10 in our original review, Overwatch is a fantastic first-person shooter with engaging mechanics and a host of charming characters.
Twitch will stream all regular season and postseason contests and serve as the sole broadcaster for half of the league's 12 weekly matches, while the others will be simultaneously streamed on Major League Gaming, the platform owned by Overwatch publisher Activision-Blizzard.
"Our fans love to engage with content on Twitch, and we wanted to drive significant viewership of the Overwatch League in its inaugural season and beyond", said Armin Zerza, COO of Blizzard Entertainment.
"The Overwatch League was created to deliver an awesome and unique experience for players, teams, and fans", said Mike Morhaime, the CEO of Blizzard.
A lot hinges on the Overwatch League's success, and their ability to keep viewers outside of the initial kickoff blast. Nevertheless, all the match-ups happening in North America, South Korea, and France will be broadcast throughout Twitch.
Missing from the deal is China, home to the biggest e-sports viewing audience, and Mr Harding-Rolls predicted there would be a separate announcement about media partnerships in this country. Overwatch League team uniforms are now available to purchase as in-game skins, giving fans a fun way to show their support for their favorite teams.