So a while back (Crow Day) I posted in IGT about how on MLB.tv I couldn't start from beginning for a game in progress. The solution I found was to go to settings and not show spoilers. That took care of the issue.
But....
It still shows spoilers in one place. When I fast forward through the commercial breaks, it says the final score underneath the fast forward (for a game that's finished.) So they still have that kink to work out. Not ideal but at least I get to see the game from the beginning. My workaround I've been using is to point my firestick remote at the tv when the half inning ends, then turn my head away and click the forward button 12 times.