Twitch is now the official third-party streaming service for games like Overwatch, with exclusive rights for Blizzard tournaments during 2017-2018, a post on PCGamer reported.
The deal also gives Twitch Prime members a golden loot box from Overwatch, with a guaranteed legendary item. The blog post on Twitch promises a further 10 loot boxes over the coming months.
Other items for Heroes of the Storm and Hearthstone are also said to be coming.
Twitch membership comes free with Amazon Prime.