I know there are places in the US that folks can't get TBS or FS1 so they think they will miss the playoffs, or maybe even the World Series.

Go to www.mlbstream.tv
Click on the game you want to watch at the top of the page.
DO NOT click on the top screen, it will usually have a photo of a large flag on the field. It will just take you to a bunch of links that want you to subscribe to their streaming service.
Click on the play icon on the bottom screen and watch the game.
If the stream is blurry, try one of the other links above that screen.
Hit full screen and there you go.
I hook my laptop through HDMI to my living room tv. You just have to remember about how long you have before your laptop goes into sleep mode.