The SF Giants are set to take on the Los Angeles Dodgers in the final game of a three-game series on Sunday. It has been a close series thus far, but for some reason the final game of the first half is going to be on Roku.
The Giants announced this on social media prior to the game as, apparently, the game will be part of Roku's "MLB Sunday Leadoff" schedule.
For some reason, today's SF Giants vs. Dodgers game will be on Roku
This article gives some more info on how you will be able to watch today's game.